Shortly after the breakaway march continued on from Market street, cops on motorcycles blocked the street (and sidewalk) we were on. They didn't allow us to proceed (on the sidewalk), and were behaving very aggressively, chasing people with their club/nightsticks. The people who were standing directly around me were shoved and hit. This girl was trying to walk down the sidewalk and was jabbed by the cop; she kept saying "but I'm on the sidewalk" and was driven to tears.