Use /gd to delete a group.
To use the /gd command, you must be a member of the Team Foundation Administrators security group. For more information, see.
Specifies the group identity. For more information on valid identity specifiers, see.
Required. Specifies the name of the application tier server.
The following example deletes a group identified by "S-1-5-21-2127521184-1604012920-1887927527-588340", the security identifier (SID).
>TFSSecurity /gd S-1-5-21-2127521184-1604012920-1887927527-588340 /server:MyATServer