Hmmm, I think of them as colleges, to school hardened criminals.
Don’t get me wrong, we do need prisons and crimes must have consequences. But a caring society which seeks to encourage and support people to live a decent life will have much less need of prisons. And the prisons it does have will rehabilitate much larger proportions of inmates than what happens now.
Of course if prisons are privately run, with profit as the primary goal…