You know, I taught in one of these schools, and I think it's a far cry from a prison....ESPECIALLY compared to the other educational opportunities variable to poorer, urban kids.
I taught a Rock Band class after school there, which was available even to students with discipline problems. The Nobel Schools have produced nationally regarded slam poets, and have a very ambitious arts program. They do expect a lot of discipline during the day, but it's difficult to overcome the massive achievement gap these kids have without all of that structure. If you've got to read on a 10th grade level and you're only at a 6th grade, you just don't have time to waste.
If you want to talk about ankle chains, check out the opportunities you have if you're poor, black or brown in Chicago, don't have a GED, and can't read.