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Trapped
Are they negatively impacting the raid? If they are not, then leave them the fuck alone.
I've dealt with guild management like you before and it fucking sucked: dictating in game behavior on people. Never ever EVER seen a successful guild with that style of management. You've got two options:
1. Stop being a controlling asshole and leave them alone, unless, and this is the key, they are negatively affecting your raid efforts.
2. Remove them from the guild now.
Honestly, if drama is starting over a clique playing together, you have much larger issues among your guild membership. I expect one way or the other they won't be with your guild for long.