I have created a custom list named “K2 Workflow Tutorials” in which K2 workflow will be created to delete a SharePoint group.
Go to K2 designer, drag and drop Delete Group step from Groups workflow steps in the ribbon interface.
Select a site collection from which the group has to be deleted and then click on Next button.
Specify filters for the group to be deleted and then click on Finish button.
Deploy the workflow. Create a list item with title field value as “K2 Test Group”. After few minutes the workflow will be completed and the group named “K2 Test Group” will be deleted from the specified site collection.