We obviously haven't seen the last of them when the US has a network of prisons that holds almost 2.5 million people, many of them concentrated for rather obvio

We obviously haven't seen the last of them when the US has a network of prisons that holds almost 2.5 million people, many of them concentrated for rather obvious racial reasons. Just because they are built of brick and steel does not change their basic tenet. Nor does the use of prisons for such purposes or the fact that there are actual criminals in prisons in addition to the concentrated populations.