A man holds a huge piece of fake excrement bearing a banner which translates as 'this is the labor reform' during a May Day rally in Barcelona on May 1, 2012.
- [Joseph Eid/AFP/Getty Images]

Activists attend a May Day protest in Hong Kong on May 1, 2012. About 5,000 workers, domestic helpers and activists held a noisy procession and marched through the city center to call for better working conditions and a higher minimum wage.
- [Laurent Fievet/AFP/Getty Images]

A man holds a banner reading 'Damn, I lost the scissors!' during a May Day rally in the centre of Barcelona on May 1, 2012.
- [Lluis Gene/AFP/Getty Images]

Occupy Wall Street participants gather to stage a May Day march at Bryant Park in New York, May 01, 2012.
- [Emmanuel Dunand/AFP/Getty Images]

Protesters representing various groups march through downtown Los Angeles on May 1, 2012 in California, as thousands of workers, immigrant-rights activists and other protesters took part in May Day marches and rallies.
- [Frederic J. Brown/AFP/Getty Images]

Occupy Wall Street protester wears a money scarf and goggles as the movement joins with activists groups for May Day demonstrations May 1, 2012 in New York.
- [Stan Honda/AFP/Getty Images]

CGT trade-union members push a coffin whom slogan refers to French president Nicolas Sarkozy as they take part in a march as part of the annual May Day workers' events on May 1, 2012 in Lyon, central eastern. Both candidates for the French presidential election enter their final round on May 6, 2012.
- [Philippe Desmazes/AFP/Getty Images]

Evelyn Talarico, originally from Puerto Rico but now living in Brooklyn, joins the hundreds of Occupy Wall Street demonstrators dance as hundreds of protesters gather during a May Day labor rally in Bryant Park on May 1, 2012 in New York City.
- [Monika Graff/Getty Images]