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Danish Prime Minister Helle Thorning-Schmidt, is met with strong protests during her May Day speech, Wednesday May 1 2013 at Tangkroen in Aarhus, Denmark. (AP Photo/Polfoto/Daniel hjort) ( Denmark May Day )

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. JOSEP LAGO/AFP/Getty Images ( 519387269 )

Protestors shout slogans calling for better working conditions for garment workers during a May Day rally on Wednesday, May 1, 2013, in Dhaka, Bangladesh. Thousands of workers paraded through central Dhaka on May Day to demand safer working conditions and the death penalty for the owner of a building housing garment factories that collapsed last week in the country's worst industrial disaster, killing at least 402 people and injuring 2,500.(AP Photo/Wong Maye-E) ( Bangladesh May Day )

A protester shouts in front of a line of riot police officers during a protest against a demonstration of far right party NPD in Berlin, Wednesday, May 1, 2013. (AP Photo/Markus Schreiber) ( Germany May Day )

A Sri Lankan ruling party activist, his head shaved and painted, carries a placard bearing the image of Sri Lankan President Mahinda Rajapakse during a May Day rally in Colombo May 1, 2013. Sri Lanka tightened security for dozens of labour day rallies in the capital with the opposition using the occasion to focus on sharp increases in electricity and high living costs. Ishara S.KODIKARA/AFP/Getty Images ( 519385482 )

Gay rights activists clasp hands as they march during a tradition May Day rally in St.Petersburg, Russia, Wednesday, May 1, 2013. The poster reads : 'We demand the abolition of the homophobic law!'. (AP Photo/Dmitry Lovetsky) ( Russia May Day )

Sri Lankan dancers look on during a pro-government May Day rally in Colombo May 1, 2013. Sri Lanka tightened security for dozens of labour day rallies in the capital with the opposition using the occasion to focus on sharp increases in electricity and high living costs. S.KODIKARA/AFP/Getty Images ( 519385581 )

Workers carry a wreath of carnations before clashes erupted between police and protesters during May Day celebrations in Istanbul, Turkey, Wednesday May 1, 2013. The government, citing security reasons, banned a rally on Istanbul's Taksim Square, which is undergoing major renovations. Police fired tear gas to disperse hundreds of demonstrators trying to break through barricades to access the square. (AP Photo) ( Turkey May Day )

Police shelter behind their shields during clashes with protestors at a May Day demonstration on May 1, 2013, in Istanbul. Several people were injured on Wednesday as Turkish riot police used water canon and tear gas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul. BULENT KILIC/AFP/Getty Images ( 519385753 )

Workers march during a May Day rally in Jakarta, Indonesia, Wednesday, May 1, 2013. (AP Photo/Tatan Syuflana) ( Indonesia May Day )

Protesters, mostly workers, burn a mural depicting U.S. President Barack Obama and Philippine President Benigno Aquino III after being blocked by police from getting closer to the U.S. Embassy in Manila to mark International Labor Day Wednesday May 1, 2013 in Manila, Philippines. The workers, who have demanding wage increases for years, assailed Aquino for his Labor Day "gift" of non-wage benefits. The protesters have been clamoring for years for a P125-Peso ($3.125) across-the-board wage hike and condemn the Government's policy of outsourcing labor which allegedly eliminates job security. (AP Photo/Bullit Marquez) ( Philippines May Day )

Tens of thousands of people gathered for a rally on May Day in Ankara on May 1, 2013. Earlier several people were injured as Turkish riot police used water canon and tear gas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul. ADEM ALTAN/AFP/Getty Images ( 519386880 )

Activists of the All India Central Council of Trade Unions (AICCTU) participate in a May Day rally in Allahabad on May 1, 2013. Workers from various labour groups took to the streets on the occasion of the International Labour Day which is observed worldwide. Sanjay Kanojia/AFP/Getty Images ( 519387935 )

Indonesian transvestites take part in a May Day rally in Jakarta, Indonesia, Wednesday, May 1, 2013. (AP Photo/Achmad Ibrahim) ( Indonesia May Day )

A May Day demonstrator tries to protect herself as riot police use water cannon and tear gas to disperse protesters in 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. REUTERS/Murad Sezer ( EUROPE-PROTESTS/TURKEY )

A May Day protester holds a placard, a mask and tear gas canisters during clashes with riot police 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. The placard reads, ''We are not slaves, we are workers''. REUTERS/Murad Sezer ( EUROPE-PROTESTS/TURKEY )

Over 20,000 workers stage a protest against President Ma Ying-jeou's pension reforms on Labor Day on May 1, 2013 in Taipei, Taiwan. The government's cabinet recently passed bills for restructuring various pension plans. (Photo by Ashley Pon/Getty Images) ( 167834092 )

Traditional Javanese dancers perform in front of the Presidential Palace during a labor demonstration on May 1, 2013 in Jakarta, Indonesia. Tens of thousands of workers and labor activists marched through Jakarta's central business district, demanding the implementation of higher minimum wages and better working conditions. (Photo by Ed Wray/Getty Images) ( 167836431 )

People put on a Guy Fawkes masks during a protest against the government's White Paper on Population and labour-related matters that affect Singaporeans at Speakers' Corner in Hong Lim Park on May 1, 2013 in Singapore. the 6.9 million population government white paper that revealed it could increase 30% to 6.9 million by 2030, angering residents who already see a strain on housing, transportation and healthcare. This is a follow up protest after one was held on 16 Feb, 2013 organised by the same organiser, transitioning.org (Photo by Suhaimi Abdullah/Getty Images) ( 167836489 )

Demonstrators attend a a May Day rally in Taipei on May 1, 2013. More than 10,000 people took to the streets in Taipei to protest the government's planned pension cuts, including raising labour insurance fees and lowering the payment scale. Mandy Cheng/AFP/Getty Images ( 519385601 )