Demonstrators shouts slogans during May Day protests in Bogota, Colombia, May 1, 2016. (Photo by John Vizcaino/Reuters)





Riot policemen stand during May Day protests in Bogota, Colombia, May 1, 2016. (Photo by Jon Nazca/Reuters)





Demonstrators take part in May Day protests in Bogota, Colombia, May 1, 2016. (Photo by John Vizcaino/Reuters)





Demonstrators shouts slogans during May Day protests in Bogota, Colombia, May 1, 2016. (Photo by John Vizcaino/Reuters)





A youth hurls paintballs towards riot policemen during during May Day protests in Bogota, Colombia, May 1, 2016. (Photo by John Vizcaino/Reuters)





Leftist demonstrators throw petrol bombs as they clash with riot police using tear gas to disperse them during May Day celebrations in Istanbul, Sunday, May 1, 2016. Security forces prevented leftist groups trying to reach city's iconic Taksim Square to celebrate May Day. (Photo by Cagdas Erdogan/AP Photo)





Leftist demonstrators set on fire a barricade as they clash with riot police using tear gas to disperse them during May Day celebrations in Istanbul, Sunday, May 1, 2016. (Photo by Cagdas Erdogan/AP Photo)





Leftist demonstrators set on fire a barricade as they clash with riot police using tear gas to disperse them during May Day celebrations in Istanbul, Sunday, May 1, 2016. (Photo by Cagdas Erdogan/AP Photo)





Protesters, mostly workers, clash with riot police as they try to force their way closer to the gates of the US Embassy in Manila to mark the International Labor Day Sunday, May 1, 2016 in Manila, Philippines. The protesters are demanding among others, better wages and salaries, an end to contractual labor, better working conditions and retirement benefits, less taxes, public and not privatized social services, and the assertion of national sovereignty against foreign domination and control. (Photo by Bullit Marquez/AP Photo)





An Indonesian anti-riot policeman walks through a barricade as he guards a May Day rally in front of the presidential palace in Jakarta, Indonesia, May 1, 2016. (Photo by Reuters/Beawiharta)





Hundreds of protesters, mostly workers, dance around the burning effigy of Philippine President Benigno Aquino III during a rally near the Presidential Palace to mark the International Labor Day Sunday, May 1, 2016 in Manila, Philippines. (Photo by Bullit Marquez/AP Photo)





Policemen scuffle with activists during the Labor Day protest in front of the US embassy in Manila on May 1, 2016. Thousands of workers and activists marched on Philippine streets marking May Day to protest the government's migrant labour policy and demand higher wages amid rising prices for basic commodities. (Photo by Noel Celis/AFP Photo)





Protesters, mostly workers, are dispersed with water cannon as they try to force their way closer to the gates of the U.S. Embassy in Manila to mark the International Labor Day Sunday, May 1, 2016 in Manila, Philippines. (Photo by Bullit Marquez/AP Photo)





A street vendor holds drinking water as she walks near workers attending a May Day rally in front of presidential palace in Jakarta, Indonesia, May 1, 2016. (Photo by Reuters/Beawiharta)





Demonstrators, holding signs of environmental-friendly messages, say they are demanding cleaner waters in the central regions after mass fish deaths in recent weeks, in Hanoi, Vietnam May 1, 2016. (Photo by Reuters/Kham)





Demonstrators, holding signs to protest against Taiwanese enterprise Formosa Plastic and environmental-friendly messages, say they are demanding cleaner waters in the central regions after mass fish deaths in recent weeks, in Hanoi, Vietnam May 1, 2016. (Photo by Reuters/Kham)





Demonstrators, holding signs to protest against Taiwanese enterprise Formosa Plastic and environmental-friendly messages, say they are demanding cleaner waters in the central regions after mass fish deaths in recent weeks, in Hanoi, Vietnam May 1, 2016. (Photo by Reuters/Kham)





A demonstrator holds a sign which reads, “I want to eat clean fish”, with protesters who say they are demanding cleaner waters in the central regions after mass fish deaths in recent weeks, in Hanoi, Vietnam May 1, 2016. (Photo by Reuters/Kham)





A masked protestor kicks a tear gas canister during clashes with riot police as part of the traditional May Day march in Paris, France, Sunday, May 1, 2016. The traditional May Day rallies are taking on greater weight this year in France as Parliament is debating a bill that would allow longer working hours and let companies lay workers off more easily. (Photo by Michel Spingler/AP Photo)





An injured demonstrator is evacuated at the Place de la Nation as French CRS riot police advance at the end of a protest against the French labour law proposal during the May Day labour union march in Paris, France, May 1, 2016. (Photo by Charles Platiau/Reuters)





Tear gas canisters explode near riot police during clashes as part of the traditional May Day march in Paris, France, Sunday, May 1, 2016. (Photo by Michel Spingler/AP Photo)





French CRS riot police secure a position as clouds of tear gas fill the Place de la Nation during clashes with youths who protest against the French labour law proposal during the May Day labour union march in Paris, France, May 1, 2016. (Photo by Charles Platiau/Reuters)





A hooded youth throws a bottle during a clash with French riot police to protest against the French labour law proposal during the May Day labour union march in Paris, France, May 1, 2016. (Photo by Philippe Wojazer/Reuters)





Russians wave flags and cheer as they walk on Red Square to mark May Day in Moscow, Russia, Sunday, May 1, 2016, with the St. Basil's Cathedral, left, and Spasskaya Tower, right, in the background. As in Soviet times, about one hundred thousand of cheerful workers paraded across Red Square despite a chilly rain, but instead of red flags with the Communist hammer and sickle, they waved the blue flags of the dominant Kremlin party and the Russian tricolor. (Photo by Alexander Zemlianichenko/AP Photo)





Workers take a selfie as they walk on Red Square to mark May Day in Moscow, Russia, Sunday, May 1, 2016. (Photo by Alexander Zemlianichenko/AP Photo)





Russians play accordions as they walk near the building of the Federal Security Service (FSB, Soviet KGB successor) in Lubyanskaya Square to mark May Day in Moscow, Russia, Sunday, May 1, 2016. As in Soviet times, about one hundred thousand of cheerful workers paraded across Red Square despite a chilly rain, but instead of red flags with the Communist hammer and sickle, they waved the blue flags of the dominant Kremlin party and the Russian tricolor. (Photo by Alexander Zemlianichenko/AP Photo)





Russians carry flags and cheer as they walk on Red Square to mark May Day in Moscow, Russia, Sunday, May 1, 2016. (Photo by Alexander Zemlianichenko/AP Photo)





A Russian Communist party activist carries a banner with an image of late Soviet leader Joseph Stalin during a May Day rally in central Moscow on May 1, 2016. (Photo by Kirill Kudryavtsev/AFP Photo)





Russians wave flags and cheer as they walk on Red Square to mark May Day in Moscow, Russia, Sunday, May 1, 2016. (Photo by Alexander Zemlianichenko/AP Photo)





An orchestra musician plays during a May Day rally in Krasnoyarsk, Siberia, Russia, May 1, 2016. (Photo by Ilya Naymushin/Reuters)





People hold a banner which reads “Moscow is our common home” during a May Day rally at Red Square in Moscow, Russia, May 1, 2016. (Photo by Maxim Zmeyev/Reuters)





People attend a May Day rally at Red Square in Moscow, Russia, May 1, 2016. (Photo by Maxim Zmeyev/Reuters)





Russian police officers stand guard during a May Day rally at Red Square in Moscow, Russia, May 1, 2016. (Photo by Maxim Zmeyev/Reuters)





Supporters of the Communist party take part in a May Day rally, with the Christ the Saviour Cathedral seen in the background, in Moscow, Russia, May 1, 2016. (Photo by Sergei Karpukhin/Reuters)





Supporters of the Communist party are seen next to a banner with a portrait of Soviet leader Joseph Stalin during a May Day rally in Moscow, Russia, May 1, 2016. (Photo by Sergei Karpukhin/Reuters)





Orchestra musicians play trumpets during a May Day rally in Moscow, Russia, May 1, 2016. (Photo by Sergei Karpukhin/Reuters)





Participants of the traditional May Day celebrations, organized by the Austrian Social Democrats, SPOE, and trade unions walk with a flag in Vienna, Austria, on Sunday, May 1, 2016. Every year around hundred thousand citizens participate the event. (Photo by Ronald Zak/AP Photo)





Bangladeshi workers and activists participate in a May Day rally in Dhaka, Bangladesh, Sunday, May 1, 2016. Trade unions and other groups were staging rallies around the world Sunday to mark International Workers Day. (Photo by A.M. Ahad/AP Photo)





Bangladeshi garment workers shout slogans as they participate in a May Day rally in Dhaka, Bangladesh, Sunday, May 1, 2016. (Photo by A.M. Ahad/AP Photo)





Police officers detain demonstrators during clashes, in Istanbul, Turkey, Sunday, May 1, 2016. Turkish police on Sunday prevented a small group of May Day demonstrators from reaching Istanbul's iconic Taksim Square. Security forces started to detain some of the 15 people in an effort to prevent their march. (Photo by Omer Kuscu/AP Photo)





Demonstrators shout slogans against riot police during clashes, in Istanbul, Turkey, Sunday, May 1, 2016. (Photo by Mehmet Guzel/AP Photo)





Police officers detain demonstrators, in Istanbul, Turkey, Sunday, May 1, 2016. (Photo by Omer Kuscu/AP Photo)





A police officer sprays demonstrators with pepper gas during clashes, in Istanbul, Turkey, Sunday, May 1, 2016. (Photo by Omer Kuscu/AP Photo)





Turkish riot police detain a protester as he and others attempted to defy a ban and march on Taksim Square to celebrate May Day, in Besiktas neighbourhood of Istanbul, Turkey, May 1, 2016. (Photo by Yagiz Karahan/Reuters)





Turkish riot police use pepper spray while detaining a group of protesters who were attempting to defy a ban and march on Taksim Square to celebrate May Day, in Besiktas neighbourhood of Istanbul, Turkey, May 1, 2016. (Photo by Yagiz Karahan/Reuters)





Turkish riot police detain a protester as he and others attempted to defy a ban and march on Taksim Square to celebrate May Day, in Besiktas neighbourhood of Istanbul, Turkey, May 1, 2016. (Photo by Yagiz Karahan/Reuters)





Turkish riot police scuffle with a group of protesters as they attempted to defy a ban and march on Taksim Square to celebrate May Day, in Besiktas neighbourhood of Istanbul, Turkey, May 1, 2016. (Photo by Yagiz Karahan/Reuters)





Turkish riot police scuffle with a group of protesters as they attempted to defy a ban and march on Taksim Square to celebrate May Day, in Besiktas neighbourhood of Istanbul, Turkey, May 1, 2016. (Photo by Yagiz Karahan/Reuters)





A plainclothes police officer detains a protester as he and others attempted to defy a ban and march on Taksim Square to celebrate May Day, in Besiktas neighbourhood of Istanbul, Turkey, May 1, 2016. (Photo by Yagiz Karahan/Reuters)





Taiwanese workers shout slogans during a May Day rally in Taipei, Taiwan, Sunday, May 1, 2016. Thousands of protesters from different labor groups protest on the street to ask for raising minimum wage and shorter working hours. (Photo by Chiang Ying-ying/AP Photo)





Foreign participants in Taiwan shout slogans during a May Day rally in Taipei, Taiwan, Sunday, May 1, 2016. (Photo by Chiang Ying-ying/AP Photo)