Demonstrators run from tear gas during a May Day protest in Bogota, Colombia, Sunday, May 1, 2011. (AP Photo/Fernando Vergara)

A girl waves an American flag while participating in a rally for jobs and immigration rights in New York, Sunday, May 1, 2011. (AP Photo/Seth Wenig)

Workers participate in a May Day rally marching with photos of Libyan leader Moammar Gadhafi through the streets of San Salvador, El Salvador, Sunday May 1, 2011. (AP Photo/Luis Romero)

Jessica Vazquez, 17, Atlanta, chants "we can do it" in Spanish during a May Day rally in Atlanta on Sunday, May 1, 2011 at the Georgia Capitol, where protestors urged Ga. Gov. Nathan Deal to veto immigration legislation passed last month by the legislature. (AP Photo/Rich Addicks)

A Tamil demonstrator, left, depicting a Sri Lankan soldier, pretends to be hitting Tamil people holding a fake automatic weapon, during a protest against the Sri Lanka government, as part of the May Day march in central London, Sunday, May 1, 2011. (AP Photo/Lefteris Pitarakis)

Demonstrators gather at central London's Trafalgar Square in front of the National Portrait Gallery, following the May Day march, Sunday, May 1, 2011.  (AP Photo/Lefteris Pitarakis)

Supporters of the Sri Lanka's ruling party United People's Freedom Alliance, wear masks of UN Secretary General Ban Ki-moon, left an UN expert Marzuki Darusman during a May Day rally in Colombo, Sri Lanka, Sunday, May 1, 2011. (AP Photo/ Eranga Jayawardena)

An immigrant demonstrator who works in Greece chants slogans during a protest in central Athens, on Sunday, May 1, 2011. Police turned out in numbers in anticipation of unions' and leftists' protest marches, but the rallies were peaceful and passed off without incident. (AP Photo/Kostas Tsironis)

Indonesian police officers run to avoid smoke from burning tires set on fire by workers during a May Day protest outside the presidential palace in Jakarta, Indonesia, Sunday, May 1, 2011. (AP Photo/Irwin Fedriansyah)

University students get their heads shaved before trying to march towards President's House in protest against rising student tuition fees in downtown Seoul, South Korea, on May Day, Sunday, May 1, 2011. (AP Photo/Lee Jin-man)

A man holds an old communists flag during a May Day rally on International Workers Day, in central Belgrade, Serbia, Sunday, May 1, 2011. (AP Photo/Darko Vojinovic)

A protester wearing a mask with a slogan "Stop poor" participates in a march in Taipei, Taiwan, on Labor Day, Sunday, May 1, 2011. About 2,000 people rallied in Taipei to protest against the island's increasing income gap and demand the government create better work conditions. (AP Photo/Chiang Ying-ying)