Deleting forks of private repositories
While forks of private repositories are deleted when a collaborator is removed, the person will still retain any local clones of your repository.
Removing collaborator permissions from a person contributing to a repository
-
On GitHub Enterprise Server, navigate to the main page of the repository.
-
Under your repository name, click Settings.
-
In the left sidebar, click Collaborators & teams.
-
Next to the collaborator you want to remove, click the X icon.