How to delete groups being used by a module?

How to delete groups being used by a module?

I need to delete a few groups in service desk but it reports that are being used by a module and cannot be deleted. I've spent some time going through each option in settings trying to determine what has to removed in order to clear the module usage but can't figure it out. How can I tell which areas need to be cleared of the group references so they can be deleted?

Message - 

Group is being used by a module. Hence cannot delete it.


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