Author and former A.C.L.U. attorney Michelle Alexander has a new book coming out. "THE NEW 'JIM CROW' ": Mass Incarceration in a Colored Blind Society States that the overwhelming incarceration of blacks are not due to them committing violent offenses. But in fact, are due to being caught riding dirty. Especially if they are caught with a small amount of crack cocaine. The prison population has pentupled because of this. Many arrests involved people who just didnt know their rights.