This action runs when a Group Manager is unassigned from a group.
do_action('pm_unassign_group_manager_privilege',$gid,$user_id);
Simple example
function ProfileGrid_unassign_group_manager($gid,$user_id) { //do something with the user id and Group ID when a Group Manager is unassigned from a group. } add_action('pm_unassign_group_manager_privilege','ProfileGrid_unassign_group_manager');