I seem to remember some city in the east coast fired their whole department and then hired back selected ones. And hired new cops to replace the guys they wante

I seem to remember some city in the east coast fired their whole department and then hired back selected ones. And hired new cops to replace the guys they wanted to get rid of. And it helped. A suggestion I've thought of before and have seen in the wold increasingly is pay cops a stipend to pay for their own insurance. If they can't get insurance they get fired automatically.