Photos: May Day protests around the world
APTOPIX May Day Protests
Demonstrators clash with police during May Day protests demanding everything from wage increases to an end to austerity measures, Tuesday, May 1, 2012 in Oakland, Calif. Stinging gas has sent May Day protesters fleeing a downtown Oakland intersection as police took at least four people into custody. The chaotic scene recalls several earlier clashes between Occupy protesters and Oakland police. (AP Photo/Marcio Jose Sanchez)