Fire them. If they’re civil service and can’t be fired, then reshuffle them so that they’re all working out of the basement, preferably with a mop and bucket. There are ways to put people that are a serious problem in positions where they are very uncomfortable. Uncomfortable enough to reform, or to leave on their own.
> then reshuffle them so that they’re all working out of the basement,
And whatever happens, don’t let them keep their red Swingline stapler!