Kwame J. Thomas, of St. Louis, pleaded guilty on Jan. 8, 2013, in a 2011 “knockout game” attack on a man in St. Louis. ... In April 2011 an elderly man was attacked by a mob of black youths playing “the knock out game” while walking home from the grocery store with his wife. They killed him. In June 2011 a group of black youths beat a gay man bloody playing “the knock out game.” In August 2011 black teen mobs targeted St. Louis cyclists in the knock out game. In September 2011, a 73-year-old man was knocked unconscious just...