My mice village is getting out of control?

So I have been building a village of mice in my house. I gave them basic supplies to start them off but really I'd like for them to be self sustaining. Anyway a small group started developing on the outskirts of the village and they are growing very quickly. They have radical ideas and aren't afraid to get violent. I've seen them surround other mice and nibble them to death. Recently there have been talks of an overthrow. Should I do something about this new group forming or should I just let it play out and let the strongest group survive?