Article Photos: Stinging gas sends May Day protesters fleeing 11/16

  A protestor, left, runs as he attempts to evade police before being arrested during a May Day protest on Tuesday, May 1, 2012 in Oakland, Calif. Hundreds of activists across the U.S. joined the worldwide May Day protests on Tuesday, with Occupy Wall Street members in several cities leading demonstrations and in some cases clashing with police. (AP Photo/Ben Margot)