“Prison is quite literally a ghetto in the most classic sense of the word, a place where the U.S. government now puts not only the dangerous but also the inconvenient—people who are mentally ill, people who are addicts, people who are poor and uneducated and unskilled. Meanwhile the ghetto in the outside world is a prison as well, and a much more difficult one to escape from than this correctional compound. In fact, there is basically a revolving door between our urban and rural ghettos and the formal ghetto of our prison system.”