Have you heard of the Knockout game? A gang member goes up to a pedestrian on the street and punches him/her in the face or pushes him to the ground, then runs away. It started in NYC and spread to other parts of the East coast. Now there are two cases in Milwaukee.
Brutal "Knockout Game" Incident In Milwaukee http://www.wisconsinfree.com/index.php/articles/284
"The Wisconsin Free has obtained exclusive video from a "pull camera"* used in high violence areas of yet another supposed victim to the so-called “Knockout Game,” also known as “Point ‘em Out, Knock ‘em Out.” The latest incident occurred near the Milwaukee Collegiate Academy at 4030 North 29th St. in Milwaukee."