Ok thanks, that's what I figured Imprison would do, but I didn't know how many turns it would take to remove the Criminal Trait, and generally speaking, missing out on a citizen's production for a few turns is not worth it.
And yes, late game crime doesn't really matter, but early-mid game if you aren't proactively displacing Criminals (via Constructor), then you could really get too many Criminal spawns where it becomes an issue.