So one of my "friendly" neighbours dropped his crime syndicate on my capital, which insta spawned a criminal underworld. Fast forward 5 years and the crime rate is 0 and the syndicate is removed. But the criminal underworld won't go away- it says it only generates a criminal job every 33 crime, but my crime rate is zero and he's still here. I've tried shipping off that pop to other planets but that hasn't helped either.