Demonstrators dressed up as characters of the video game Pac-Man and wearing masks of Spanish Prime Minister Mariano Rajoy (C) and German Chancellor Angela Merkel (L), take part a Labour Day march against the Spanish government's austerity policies in the centre of Barcelona on May 1, 2013. Tens of thousands protested across the globe for May Day to press for workers' rights amid tough economic times and to back an array of other causes. (Photo by Josep Lago/AFP Photo)

Protesters against a govenment proposal for the culling of badgers gather outside the Department for Environment, Food and Rural Affairs (DEFRA) in central London on May 1, 2013. Britain is set to cull up to 5,000 badgers in a bid to combat tuberculosis in cattle which has outraged animal welfare groups, after two pilot schemes were given the green light in February. (Photo by Andrew Cowie/AFP Photo)

People walk through the spray of a police water cannon after clashes broke out between protesters and security forces at the annual May Day march in Santiago, Chile. (Photo by Luis Hidalgo/Associated Press)

Police use batons as they clash with protesters at the annual May Day march in Santiago. (Photo by Luis Hidalgo/Associated Press)

Workers try to pull a road block down during a protest on May Day in Taipei. More than 10,000 Taiwanese workers took to the streets to protest a government reform plan that will cut pension payouts to ease Taiwan's worsening fiscal problems. The protesters said the payout cuts reflect a longstanding government policy to bolster economic growth at the expense of workers' benefits and compromised workplace safety. (Photo by Chiang Ying-ying/Associated Press)

Left wing activists attack a bank during May Day demonstrations in Berlin. (Photo by Markus Schreiber/Associated Press)

Left-wing protesters clash with police in Hamburg during May Day demonstrations. May Day, the international day of labour, is a national holiday in Germany and is observed with gatherings by labour unions and political parties. In some cities, including Hamburg and Berlin, the day often ends with violent clahes between police and mostly left-wing demonstrators. (Photo by Joern Pollex/Getty Images)

Danish Prime Minister Helle Thorning-Schmidt is met with strong protests during her May Day speech in Aarhus, Denmark. (Photo by Daniel Hjort)

A portrait of President Barack Obama hangs in the Federal Building Plaza as demonstrators begin to gather following a May Day in Chicago. Hundreds of protestors participated in the two-mile march from the city's West side into the Loop. The majority of the marchers were protesting for immigration reform. (Photo by Scott Olson/Getty Images)

Russian nationalists carry a giant Russian Imperial flag during a May Day rally in St. Petersburg. (Photo by Dmitry Lovetsky/Associated Press)

Saul Linares participates in an immigration reform May Day rally in Union Square in New York. Demonstrators demanded an overhaul of U.S. immigration laws in an annual nationwide ritual that carried a special sense of urgency as Congress considers sweeping legislation that would bring many of the estimated 11 million people living in the U.S. illegally out of the shadows. (Photo by Seth Wenig/Associated Press)

A flag with the face of Che Guevara reading, “To the Victory. Always”, waves during tMay Day celebrations in Pamplona, Spain. (Photo by Alvaro Barrientos/Associated Press)

Indonesian workers painted in red chant slogans during a May Day rally in Jakarta, Indonesia, Wednesday, May 1, 2013. (Photo by Dita Alangkara/AP Photo)

An injured journalist is filmed and helped by his colleagues during clashes between riot police and May Day protesters in central Istanbul May 1, 2013. Turkish riot police clashed with thousands of May Day protesters in Istanbul on Wednesday, firing water cannon and tear gas at crowds that tried to break through barricades to reach the city's main square, witnesses said. The incidents followed the pattern of recent years, when May Day demonstrations in Turkey's largest city have often been marked by clashes between police and protesters. (Photo by Murad Sezer/Reuters)

A May Day protester throws a stone at riot police as he and others try to break through barricades to reach the city's main square in central Istanbul May 1, 2013. Turkish riot police clashed with thousands of May Day protesters in Istanbul on Wednesday, firing water cannons and tear gas at crowds that tried to break through barricades to reach the city's main square, witnesses said. The incidents followed the pattern of recent years, when May Day demonstrations in Turkey's largest city have often been marked by clashes between police and protesters. (Photo by Murad Sezer/Reuters)

May Day protesters throw stones at riot police as they try to break through barricades to reach the city's main square in central Istanbul May 1, 2013. Turkish riot police clashed with thousands of May Day protesters in Istanbul on Wednesday, firing water cannons and tear gas at crowds that tried to break through barricades to reach the city's main square, witnesses said. The incidents followed the pattern of recent years, when May Day demonstrations in Turkey's largest city have often been marked by clashes between police and protesters. (Photo by Serkan Senturk/Reuters)

Protesters take part in a May Day demonstration on Labour Day in Malaga, southern Spain May 1, 2013. Workers hit by lower living standards and record high unemployment staged May Day protests across Europe on Wednesday, hoping to persuade euro zone governments of the case for easing austerity measures and boosting growth. The Spanish economy has shrunk for seven consecutive quarters, and unemployment stands at a record 27 percent. (Photo by Jon Nazca/Reuters)

Indonesian workers with their faces and bodies painted in white and an Indonesian word “Buruh” that means “Workers” in red take part in a rally commemorating May Day in Jakarta, Indonesia, Wednesday, May 1, 2013. (Photo by Achmad Ibrahim/AP Photo)

A May Day protester shouts as he tries to break through barricades to reach the city's main square in central Istanbul May 1, 2013. Turkish riot police clashed with thousands of May Day protesters in Istanbul on Wednesday, firing water cannons and tear gas at crowds that tried to break through barricades to reach the city's main square, witnesses said. The incidents followed the pattern of recent years, when May Day demonstrations in Turkey's largest city have often been marked by clashes between police and protesters. (Photo by Murad Sezer/Reuters)

A demonstrator is detained during May Day rallies in Santiago May 1, 2013. (Photo by Ivan Alvarado/Reuters)

A veteran of World War II walks ahead the Ukrainian Communists march and rally marking May Day in the center of Kiev. (Photo by Sergei Supinsky/Getty Images)

Demonstrators back away from a “flash bang” object used by police during a May Day protest in Seattle. Police used “flash bangs” and pepper spray against some protesters who pelted them with rocks and bottles late Wednesday, as violence erupted during May Day in Seattle. Several dozen protesters, many using bandanas to cover their faces, began clashing with police in downtown Seattle hours after a peaceful immigrant-rights march ended. (Photo by Jordan Stead/Seattlepi.com)

Maria Jose Duvalle, 75, wears a red carnation in her hair during the May Day workers march in Lisbon. The red carnation is the symbol of the April 25 leftist military uprising that restored democracy to Portugal after almost a half century of dictatorship. (Photo by Francisco Seco/Associated Press)

Riot police stand guard in Bolivar square after the annual May Day march ended in clashes in Bogota, Colombia, Wednesday, May 1, 2013. In protests, parades, strikes and other demonstrations held in cities across the planet, activists lashed out at political and business leaders they allege have ignored workers' voices or enriched themselves at the expense of laborers during what has been a difficult few years for the global economy. (Photo by Fernando Vergara/AP Photo)

Members of various labour unions take part in the traditional May Day rally in Sao Paulo, Brazil, on May 1, 2013. (Photo by Caio Kenji/G1)

German riot police officers watch the crowd as a protester gestures during a May Day demonstration in Berlin. (Tobias Schwarz/Reuters)