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

  Protestors fill the intersection of 14th and Broadway during May Day protests on Tuesday, May 1, 2012 in downtown 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)