May Day rallies around the world

4 of 10: People demonstrate during a May Day leftist protest in Paris, Tuesday, May, 1, 2012. Tens of thousands of workers, leftists and union leaders around France are marking May Day with marches and rallies, in an ambiance of optimism ahead of presidential elections Sunday that a Socialist is expected to win. Anger has emerged during the campaign at austerity measures pushed by European Union leaders and conservative President Nicolas Sarkozy. (AP Photo/Thibault Camus)

REPLAY SLIDESHOW