diff --git a/app/contracts/labels/base_contract.rb b/app/contracts/labels/base_contract.rb
new file mode 100644
index 000000000000..df72474fd304
--- /dev/null
+++ b/app/contracts/labels/base_contract.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class BaseContract < ::ModelContract
+    attribute :name
+  end
+end
diff --git a/app/contracts/labels/create_contract.rb b/app/contracts/labels/create_contract.rb
new file mode 100644
index 000000000000..138068ae86db
--- /dev/null
+++ b/app/contracts/labels/create_contract.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class CreateContract < BaseContract
+    validate :user_allowed_to_create
+
+    private
+
+    def user_allowed_to_create
+      unless user.active? && (user.admin? || user.allowed_in_any_project?(:edit_work_packages))
+        errors.add :base, :error_unauthorized
+      end
+    end
+  end
+end
diff --git a/app/contracts/labels/delete_contract.rb b/app/contracts/labels/delete_contract.rb
new file mode 100644
index 000000000000..4b0eb5804c2d
--- /dev/null
+++ b/app/contracts/labels/delete_contract.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class DeleteContract < ::DeleteContract
+    delete_permission :admin
+  end
+end
diff --git a/app/contracts/labels/update_contract.rb b/app/contracts/labels/update_contract.rb
new file mode 100644
index 000000000000..d2a92df2eb77
--- /dev/null
+++ b/app/contracts/labels/update_contract.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class UpdateContract < BaseContract
+    include RequiresAdminGuard
+  end
+end
diff --git a/app/models/label.rb b/app/models/label.rb
index c6c2b8fb2809..763f5b5d9d29 100644
--- a/app/models/label.rb
+++ b/app/models/label.rb
@@ -33,11 +33,11 @@ class Label < ApplicationRecord
   has_many :labelings, dependent: :delete_all
 
   scope :with_usage_count, -> {
-    left_joins(:labelings)
-      .select("labels.*, COUNT(labelings.id) AS usage_count")
-      .group(:id)
+    select("labels.*, (SELECT COUNT(*) FROM labelings WHERE labelings.label_id = labels.id) AS usage_count")
   }
 
+  normalizes :name, with: -> { it.squish }
+
   validates :name,
             presence: true,
             uniqueness: { case_sensitive: false },
diff --git a/app/models/queries/labels.rb b/app/models/queries/labels.rb
new file mode 100644
index 000000000000..2ac693a3ea59
--- /dev/null
+++ b/app/models/queries/labels.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Queries::Labels
+  ::Queries::Register.register(LabelQuery) do
+    filter Filters::NameFilter
+  end
+end
diff --git a/app/models/queries/labels/filters/label_filter.rb b/app/models/queries/labels/filters/label_filter.rb
new file mode 100644
index 000000000000..7a10433f6d7c
--- /dev/null
+++ b/app/models/queries/labels/filters/label_filter.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+class Queries::Labels::Filters::LabelFilter < Queries::Filters::Base
+  self.model = Label
+end
diff --git a/app/models/queries/labels/filters/name_filter.rb b/app/models/queries/labels/filters/name_filter.rb
new file mode 100644
index 000000000000..12e1dfab4131
--- /dev/null
+++ b/app/models/queries/labels/filters/name_filter.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+class Queries::Labels::Filters::NameFilter < Queries::Labels::Filters::LabelFilter
+  def self.key
+    :name
+  end
+
+  def type
+    :string
+  end
+
+  def human_name
+    Label.human_attribute_name(name)
+  end
+
+  def available_operators
+    [::Queries::Operators::Contains, ::Queries::Operators::Everywhere, ::Queries::Operators::NotContains]
+  end
+
+  def where
+    escaped = ActiveRecord::Base.sanitize_sql_like(values.first)
+    case operator
+    when "~", "**"
+      ["labels.name ILIKE :q", { q: "%#{escaped}%" }]
+    when "!~"
+      ["labels.name NOT ILIKE :q", { q: "%#{escaped}%" }]
+    else
+      raise "Unsupported operator #{operator}"
+    end
+  end
+end
diff --git a/app/models/queries/labels/label_query.rb b/app/models/queries/labels/label_query.rb
new file mode 100644
index 000000000000..44ec09a0a67f
--- /dev/null
+++ b/app/models/queries/labels/label_query.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+class Queries::Labels::LabelQuery
+  include Queries::BaseQuery
+  include Queries::UnpersistedQuery
+
+  def self.model
+    Label
+  end
+
+  def default_scope
+    Label.with_usage_count.order(Label.arel_table[:name].lower.asc)
+  end
+end
diff --git a/app/services/labels/create_service.rb b/app/services/labels/create_service.rb
new file mode 100644
index 000000000000..61b4bee4b80d
--- /dev/null
+++ b/app/services/labels/create_service.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class CreateService < ::BaseServices::Create
+  end
+end
diff --git a/app/services/labels/delete_service.rb b/app/services/labels/delete_service.rb
new file mode 100644
index 000000000000..3efeeb5600c9
--- /dev/null
+++ b/app/services/labels/delete_service.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class DeleteService < ::BaseServices::Delete
+  end
+end
diff --git a/app/services/labels/set_attributes_service.rb b/app/services/labels/set_attributes_service.rb
new file mode 100644
index 000000000000..82c923683c04
--- /dev/null
+++ b/app/services/labels/set_attributes_service.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class SetAttributesService < ::BaseServices::SetAttributes
+    private
+
+    def set_default_attributes(_params)
+      model.change_by_system do
+        model.author = user
+      end
+    end
+  end
+end
diff --git a/app/services/labels/update_service.rb b/app/services/labels/update_service.rb
new file mode 100644
index 000000000000..c1c55adede2a
--- /dev/null
+++ b/app/services/labels/update_service.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Labels
+  class UpdateService < ::BaseServices::Update
+  end
+end
diff --git a/spec/contracts/labels/create_contract_spec.rb b/spec/contracts/labels/create_contract_spec.rb
new file mode 100644
index 000000000000..ec9e2e9160b0
--- /dev/null
+++ b/spec/contracts/labels/create_contract_spec.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+require "contracts/shared/model_contract_shared_context"
+require_relative "shared_contract_examples"
+
+RSpec.describe Labels::CreateContract do
+  include_context "ModelContract shared context"
+
+  shared_let(:project) { create(:project) }
+
+  let(:label) { build(:label) }
+  let(:contract) { described_class.new(label, current_user) }
+
+  it_behaves_like "label contract" do
+    let(:current_user) do
+      create(:user, member_with_permissions: { project => %i[edit_work_packages] })
+    end
+  end
+
+  context "when admin" do
+    let(:current_user) { create(:admin) }
+
+    it_behaves_like "contract is valid"
+  end
+
+  context "when member without edit_work_packages permission" do
+    let(:current_user) do
+      create(:user, member_with_permissions: { project => %i[view_work_packages] })
+    end
+
+    it_behaves_like "contract user is unauthorized"
+  end
+
+  include_examples "contract reuses the model errors" do
+    let(:current_user) { create(:admin) }
+  end
+end
diff --git a/spec/contracts/labels/delete_contract_spec.rb b/spec/contracts/labels/delete_contract_spec.rb
new file mode 100644
index 000000000000..8c2a50b80f42
--- /dev/null
+++ b/spec/contracts/labels/delete_contract_spec.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+require "contracts/shared/model_contract_shared_context"
+
+RSpec.describe Labels::DeleteContract do
+  include_context "ModelContract shared context"
+
+  let(:label) { create(:label) }
+  let(:contract) { described_class.new(label, current_user) }
+
+  it_behaves_like "contract is valid for active admins and invalid for regular users"
+
+  include_examples "contract reuses the model errors" do
+    let(:current_user) { build_stubbed(:admin) }
+  end
+end
diff --git a/spec/contracts/labels/shared_contract_examples.rb b/spec/contracts/labels/shared_contract_examples.rb
new file mode 100644
index 000000000000..06ef404e3d14
--- /dev/null
+++ b/spec/contracts/labels/shared_contract_examples.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+
+RSpec.shared_examples_for "label contract" do
+  let(:locked_user) { create(:admin, status: User.statuses[:locked]) }
+
+  it_behaves_like "contract is valid"
+
+  context "when name is blank" do
+    before { label.name = "" }
+
+    it_behaves_like "contract is invalid", name: :blank
+  end
+
+  context "when name is too long" do
+    before { label.name = "a" * 256 }
+
+    it_behaves_like "contract is invalid", name: :too_long
+  end
+
+  context "when name is already taken" do
+    before { create(:label, name: label.name.upcase) }
+
+    it_behaves_like "contract is invalid", name: :taken
+  end
+
+  context "when the acting user is locked" do
+    let(:contract) { described_class.new(label, locked_user) }
+
+    it_behaves_like "contract user is unauthorized"
+  end
+end
diff --git a/spec/contracts/labels/update_contract_spec.rb b/spec/contracts/labels/update_contract_spec.rb
new file mode 100644
index 000000000000..2ae1f9e73856
--- /dev/null
+++ b/spec/contracts/labels/update_contract_spec.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+require "contracts/shared/model_contract_shared_context"
+require_relative "shared_contract_examples"
+
+RSpec.describe Labels::UpdateContract do
+  include_context "ModelContract shared context"
+
+  let(:label) { build_stubbed(:label) }
+  let(:contract) { described_class.new(label, current_user) }
+
+  it_behaves_like "label contract" do
+    let(:current_user) { create(:admin) }
+  end
+
+  context "when non-admin" do
+    let(:current_user) { create(:user) }
+
+    it_behaves_like "contract user is unauthorized"
+  end
+
+  include_examples "contract reuses the model errors" do
+    let(:current_user) { create(:admin) }
+  end
+end
diff --git a/spec/models/label_spec.rb b/spec/models/label_spec.rb
index a9fbb5351fbf..382c4e6a38ed 100644
--- a/spec/models/label_spec.rb
+++ b/spec/models/label_spec.rb
@@ -48,6 +48,12 @@
     end
   end
 
+  describe "normalizations" do
+    subject { build(:label) }
+
+    it { is_expected.to normalize(:name).from("  Machine   Learning ").to("Machine Learning") }
+  end
+
   describe ".with_usage_count" do
     it "counts the labelings of each label, including unused ones" do
       used = create(:label)
@@ -58,6 +64,14 @@
 
       expect(counts).to eq(used.id => 2, unused.id => 0)
     end
+
+    it "keeps a scalar total when paginated" do
+      create_list(:label, 2)
+      create(:labeling, label: described_class.first)
+
+      expect(described_class.with_usage_count.paginate(page: 1, per_page: 1).total_entries)
+        .to eq(described_class.count)
+    end
   end
 
   describe "#destroy" do
diff --git a/spec/models/queries/labels/filters/name_filter_spec.rb b/spec/models/queries/labels/filters/name_filter_spec.rb
new file mode 100644
index 000000000000..136f7c967974
--- /dev/null
+++ b/spec/models/queries/labels/filters/name_filter_spec.rb
@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+
+RSpec.describe Queries::Labels::Filters::NameFilter do
+  include_context "filter tests"
+  let(:values) { ["app"] }
+  let(:model) { Label }
+
+  it_behaves_like "basic query filter" do
+    let(:class_key) { :name }
+    let(:human_name) { Label.human_attribute_name(:name) }
+    let(:type) { :string }
+    let(:model) { Label }
+
+    describe "#available_operators" do
+      it "supports ~, ** and !~" do
+        expect(instance.available_operators)
+          .to eql [Queries::Operators::Contains, Queries::Operators::Everywhere, Queries::Operators::NotContains]
+      end
+    end
+  end
+
+  describe "#apply_to" do
+    context 'for "~"' do
+      let(:operator) { "~" }
+
+      it "is the same as handwriting the query" do
+        expected = model.where("labels.name ILIKE '%app%'")
+
+        expect(instance.apply_to(model).to_sql).to eql expected.to_sql
+      end
+    end
+
+    context 'for "**"' do
+      let(:operator) { "**" }
+
+      it "is the same as handwriting the query" do
+        expected = model.where("labels.name ILIKE '%app%'")
+
+        expect(instance.apply_to(model).to_sql).to eql expected.to_sql
+      end
+    end
+
+    context 'for "!~"' do
+      let(:operator) { "!~" }
+
+      it "is the same as handwriting the query" do
+        expected = model.where("labels.name NOT ILIKE '%app%'")
+
+        expect(instance.apply_to(model).to_sql).to eql expected.to_sql
+      end
+    end
+  end
+end
diff --git a/spec/models/queries/labels/label_query_spec.rb b/spec/models/queries/labels/label_query_spec.rb
new file mode 100644
index 000000000000..07b4e334543b
--- /dev/null
+++ b/spec/models/queries/labels/label_query_spec.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+
+RSpec.describe Queries::Labels::LabelQuery do
+  shared_let(:admin) { create(:admin) }
+
+  shared_let(:banana) { create(:label, name: "banana") }
+  shared_let(:apple) { create(:label, name: "Apple") }
+  shared_let(:cherry) { create(:label, name: "cherry") }
+
+  let(:instance) { described_class.new(user: admin) }
+
+  describe "#results" do
+    it "orders labels case-insensitively by name" do
+      expect(instance.results.to_a).to eq([apple, banana, cherry])
+    end
+
+    it "exposes the usage count of each label" do
+      create(:labeling, label: apple)
+
+      counts = instance.results.index_by(&:id).transform_values(&:usage_count)
+
+      expect(counts).to eq(apple.id => 1, banana.id => 0, cherry.id => 0)
+    end
+
+    it "paginates with a correct scalar total" do
+      expect(instance.results.paginate(page: 1, per_page: 1).total_entries).to eq(3)
+    end
+  end
+
+  describe "via ParamsToQueryService" do
+    it "applies the name filter parsed from JSON params" do
+      params = ActionController::Parameters.new(
+        filters: [{ name: { operator: "~", values: ["app"] } }].to_json
+      )
+
+      query = ParamsToQueryService.new(Label, admin, query_class: described_class).call(params)
+
+      expect(query.results.to_a).to eq([apple])
+    end
+
+    it "rejects the = operator without raising on results" do
+      params = ActionController::Parameters.new(
+        filters: [{ name: { operator: "=", values: ["x"] } }].to_json
+      )
+
+      query = ParamsToQueryService.new(Label, admin, query_class: described_class).call(params)
+
+      expect(query.valid?).to be false
+      expect { query.results.to_a }.not_to raise_error
+    end
+  end
+end
diff --git a/spec/services/labels/create_service_spec.rb b/spec/services/labels/create_service_spec.rb
new file mode 100644
index 000000000000..4de08743e4fd
--- /dev/null
+++ b/spec/services/labels/create_service_spec.rb
@@ -0,0 +1,93 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+require "services/base_services/behaves_like_create_service"
+
+RSpec.describe Labels::CreateService, type: :model do
+  it_behaves_like "BaseServices create service" do
+    let(:call_attributes) { { name: "Some name" } }
+
+    context "with a real service call" do
+      let(:stub_model_instance) { false }
+      let(:user) { create(:admin) }
+      let(:call_attributes) { { name: "Bug" } }
+
+      it "creates the label, setting the author to the calling user" do
+        expect(subject).to be_success
+
+        label = subject.result
+        expect(label).to be_persisted
+        expect(label.author).to eq(user)
+        expect(label.name).to eq("Bug")
+      end
+
+      it "fails when the name is already taken, case-insensitively" do
+        create(:label, name: "Bug")
+
+        result = described_class.new(user:).call(name: "BUG")
+
+        expect(result).to be_failure
+        expect(result.errors.symbols_for(:name)).to include(:taken)
+      end
+
+      it "fails when the name is already taken but for surrounding whitespace" do
+        create(:label, name: "Machine Learning")
+
+        result = described_class.new(user:).call(name: "  Machine Learning  ")
+
+        expect(result).to be_failure
+        expect(result.errors.symbols_for(:name)).to include(:taken)
+      end
+
+      context "with a user lacking edit_work_packages in any project" do
+        let(:user) { create(:user) }
+
+        it "is unauthorized" do
+          expect(subject).to be_failure
+          expect(subject.errors.symbols_for(:base)).to include(:error_unauthorized)
+        end
+      end
+
+      context "with a member holding edit_work_packages in a project" do
+        let(:project) { create(:project) }
+        let(:user) { create(:user, member_with_permissions: { project => %i[edit_work_packages] }) }
+
+        it "creates the label, setting the author to the calling user" do
+          expect(subject).to be_success
+
+          label = subject.result
+          expect(label).to be_persisted
+          expect(label.author).to eq(user)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/services/labels/delete_service_spec.rb b/spec/services/labels/delete_service_spec.rb
new file mode 100644
index 000000000000..646ad66e369e
--- /dev/null
+++ b/spec/services/labels/delete_service_spec.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+require "services/base_services/behaves_like_delete_service"
+
+RSpec.describe Labels::DeleteService, type: :model do
+  it_behaves_like "BaseServices delete service"
+
+  describe "with a real service call" do
+    shared_let(:admin) { create(:admin) }
+
+    let(:label) { create(:label) }
+    let(:instance) { described_class.new(user: admin, model: label) }
+
+    it "removes the label and its labelings" do
+      labeling = create(:labeling, label:)
+
+      result = instance.call
+
+      expect(result).to be_success
+      expect(Label.where(id: label.id)).not_to exist
+      expect(Labeling.where(id: labeling.id)).not_to exist
+    end
+
+    context "with a non-admin user" do
+      let(:instance) { described_class.new(user: create(:user), model: label) }
+
+      it "is unauthorized and leaves the label intact" do
+        result = instance.call
+
+        expect(result).to be_failure
+        expect(result.errors.symbols_for(:base)).to include(:error_unauthorized)
+        expect(Label.where(id: label.id)).to exist
+      end
+    end
+  end
+end
diff --git a/spec/services/labels/update_service_spec.rb b/spec/services/labels/update_service_spec.rb
new file mode 100644
index 000000000000..7d1836f7ce39
--- /dev/null
+++ b/spec/services/labels/update_service_spec.rb
@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "spec_helper"
+require "services/base_services/behaves_like_update_service"
+
+RSpec.describe Labels::UpdateService, type: :model do
+  it_behaves_like "BaseServices update service" do
+    let(:call_attributes) { { name: "Some name" } }
+  end
+
+  describe "with a real service call" do
+    shared_let(:admin) { create(:admin) }
+
+    let(:label) { create(:label, name: "Bug") }
+    let(:instance) { described_class.new(user: admin, model: label) }
+
+    it "renames the label" do
+      result = instance.call(name: "Defect")
+
+      expect(result).to be_success
+      expect(label.reload.name).to eq("Defect")
+    end
+
+    context "when the new name is already taken in a different case" do
+      before { create(:label, name: "defect") }
+
+      it "fails with a taken error and does not persist the change" do
+        result = instance.call(name: "Defect")
+
+        expect(result).to be_failure
+        expect(result.errors.symbols_for(:name)).to include(:taken)
+        expect(label.reload.name).to eq("Bug")
+      end
+    end
+
+    context "with a non-admin user" do
+      let(:instance) { described_class.new(user: create(:user), model: label) }
+
+      it "is unauthorized" do
+        result = instance.call(name: "Defect")
+
+        expect(result).to be_failure
+        expect(result.errors.symbols_for(:base)).to include(:error_unauthorized)
+        expect(label.reload.name).to eq("Bug")
+      end
+    end
+  end
+end