Index: app/controllers/groups_controller.rb
===================================================================
--- app/controllers/groups_controller.rb        (revision 24239)
+++ app/controllers/groups_controller.rb        (working copy)
@@ -23,9 +23,9 @@
 
   before_action :require_admin, :except => [:show]
   before_action :find_group, :except => [:index, :new, :create]
-  accept_api_auth :index, :show, :create, :update, :destroy, :add_users, :remove_user
+  accept_api_auth :index, :show, :create, :update, :destroy, :add_users, :remove_users
 
-  require_sudo_mode :add_users, :remove_user, :create, :update, :destroy, :edit_membership, :destroy_membership
+  require_sudo_mode :add_users, :remove_users, :create, :update, :destroy, :edit_membership, :destroy_membership
 
   helper :custom_fields
   helper :principal_memberships
@@ -117,7 +117,14 @@
     @users = User.not_in_group(@group).where(:id => (params[:user_id] || params[:user_ids])).to_a
     @group.users << @users
     respond_to do |format|
-      format.html {redirect_to edit_group_path(@group, :tab => 'users')}
+      format.html do
+        if request.referer.presence == edit_group_path(@group, :tab => 'users')
+          redirect_to edit_group_path(@group, :tab => 'users')
+        else
+          redirect_back fallback_location: edit_group_path(@group, tab: 'users'),
+                        notice: l(:notice_successful_update)
+        end
+      end
       format.js
       format.api do
         if @users.any?
@@ -129,12 +136,26 @@
     end
   end
 
-  def remove_user
-    @group.users.delete(User.find(params[:user_id])) if request.delete?
+  def remove_users
+    @users = User.in_group(@group).where(:id => (params[:user_id] || params[:user_ids])).to_a
+    @group.users.delete(@users)
     respond_to do |format|
-      format.html {redirect_to edit_group_path(@group, :tab => 'users')}
+      format.html do
+        if request.referer.presence == edit_group_path(@group, :tab => 'users')
+          redirect_to edit_group_path(@group, :tab => 'users')
+        else
+          redirect_back fallback_location: edit_group_path(@group, tab: 'users'),
+                        notice: l(:notice_successful_delete)
+        end
+      end
       format.js
-      format.api {render_api_ok}
+      format.api do
+        if @users.any?
+          render_api_ok
+        else
+          render_api_errors "#{l(:label_user)} #{l('activerecord.errors.messages.invalid')}"
+        end
+      end
     end
   end
 
Index: app/views/context_menus/users.html.erb
===================================================================
--- app/views/context_menus/users.html.erb      (revision 24239)
+++ app/views/context_menus/users.html.erb      (working copy)
@@ -36,4 +36,33 @@
                             method: :delete, class: 'icon icon-del' %>
     </li>
   <% end %>
+  <li class="folder">
+    <a href="#" class="submenu"><%= l(:label_add_user_to_group) %></a>
+    <span class="icon-only"><%= sprite_icon('angle-right', rtl: true) %></span>
+    <ul>
+      <% Group.givable.order(:name).each do |group| %>
+        <li>
+          <%= context_menu_link group.name,
+              group_users_path(user_ids: @users.map(&:id), id: group.id),
+              :method => :post,
+              :disabled => false %>
+        </li>
+      <% end %>
+    </ul>
+  </li>
+  <li class="folder">
+    <a href="#" class="submenu"><%= l(:label_remove_user_from_group) %></a>
+    <span class="icon-only"><%= sprite_icon('angle-right', rtl: true) %></span>
+    <ul>
+      <% Group.givable.order(:name).each do |group| %>
+        <li>
+          <%= context_menu_link group.name,
+              group_remove_users_path(user_ids: @users.map(&:id), id: group.id),
+              :method => :post,
+              :disabled => false,
+              :data => { confirm: l(:text_are_you_sure) } %>
+        </li>
+      <% end %>
+    </ul>
+  </li>
 </ul>
 
Index: app/views/groups/remove_user.js.erb
===================================================================
--- app/views/groups/remove_user.js.erb (revision 24239)
+++ app/views/groups/remove_user.js.erb (nonexistent)
@@ -1 +0,0 @@
-$('#tab-content-users').html('<%= escape_javascript(render :partial => 'groups/users') %>');

Property changes on: app/views/groups/remove_user.js.erb
___________________________________________________________________
Deleted: svn:eol-style
## -1 +0,0 ##
-native
\ No newline at end of property
Index: app/views/groups/remove_users.js.erb
===================================================================
Index: config/routes.rb
===================================================================
--- config/routes.rb    (revision 24239)
+++ config/routes.rb    (working copy)
@@ -344,7 +344,8 @@
 
   get 'groups/:id/users/new', :to => 'groups#new_users', :id => /\d+/, :as => 'new_group_users'
   post 'groups/:id/users', :to => 'groups#add_users', :id => /\d+/, :as => 'group_users'
-  delete 'groups/:id/users/:user_id', :to => 'groups#remove_user', :id => /\d+/, :as => 'group_user'
+  delete 'groups/:id/users/:user_id', :to => 'groups#remove_users', :id => /\d+/, :as => 'group_user'
+  post 'groups/:id/remove_users', :to => 'groups#remove_users', :id => /\d+/, :as => 'group_remove_users'
 
   resources :trackers, :except => :show do
     collection do