Children dressed in traditional Crimean Tatar outfits walk during a May Day rally in Simferopol, Crimea, May 1, 2016. (Photo by Pavel Rebrov/Reuters)





A woman carries a portrait of Cuba's former president Fidel Castro during a May Day rally in Istanbul, Turkey, May 1, 2016. (Photo by Murad Sezer/Reuters)





Protestors with flags of Kurdistan scuffle with policemen in plain clothes during a May Day demonstration in Istanbul, Turkey, May 1, 2016. (Photo by Murad Sezer/Reuters)





People walk behind a red banner with hammer and sickle symbols during a May Day rally in Istanbul, Turkey, May 1, 2016. (Photo by Murad Sezer/Reuters)





People wave flags with pictures of imprisoned Kurdish rebel leader Abdullah Ocalan during a May Day rally in Istanbul, Turkey May 1, 2016. (Photo by Murad Sezer/Reuters)





A member of the Comisiones Obreras (CCOO) checks the microphone inside a car as she takes part in a May Day rally in Malaga, Spain, May 1, 2016. (Photo by Jon Nazca/Reuters)





A supporter of the Communist party uses a scissors to make holes on a banner as he takes part in a May Day rally in Malaga, Spain, May 1, 2016. (Photo by Jon Nazca/Reuters)





A man and his son carry flags of the Communist party and Izquierda Unida (IU) as they leave a May Day rally in Malaga, Spain, May 1, 2016. (Photo by Jon Nazca/Reuters)





A member of the General Workers Union (UGT) carries flags as he takes part in a May Day rally in Malaga, Spain, May 1, 2016. (Photo by Jon Nazca/Reuters)





Kindergarten workers hit kitchenware and shout anti-government slogans during a protest demanding an increase in their monthly wages on the occasion of May Day in Chandigarh, India, May 1, 2016. (Photo by Ajay Verma/Reuters)





Labour Party supporters celebrate before the arrival of Prime Minister and party leader Joseph Muscat at a May Day rally organised by the party in Valletta, Malta, May 1, 2016. (Photo by Darrin Zammit Lupi/Reuters)





People walk through the streets at the traditional MyFest street festival in Berlin's Kreuzberg district, Germany, May 1, 2016. (Photo by Fabrizio Bensch/Reuters)





Left-wing demonstrators take part in a May Day march in Hamburg, Germany, May 1, 2016. (Photo by Fabian Bimmer/Reuters)





People walk during a May Day march through Berlin's Kreuzberg district, Germany, May 1, 2016. (Photo by Fabrizio Bensch/Reuters)





Riot police runs as a woman falls down during a May Day rally in the Kreuzberg district of Berlin, Germany, 01 May 2016. (Photo by Kay Nietfeld/EPA)





German riot police line up during a May Day march through Berlin's Kreuzberg district, Germany, May1, 2016. (Photo by Fabrizio Bensch/Reuters)





A protestor throws a bottle during a May Day march in Hamburg, Germany, May 1, 2016. (Photo by Fabian Bimmer/Reuters)





People carrie a picture of Cuba's former President Fidel Castro during a May Day rally in Havana, Cuba, May 1, 2016. (Photo by Alexandre Meneghini/Reuters)





Bolivian workers participate in a parade commemorating May Day in La Paz, Bolivia May 1, 2016. (Photo by David Mercado/Reuters)





Bolivian workers participate in a parade commemorating May Day in La Paz, Bolivia May 1, 2016. (Photo by David Mercado/Reuters)





Dancers perform during a May Day rally in Havana, Cuba, May 1, 2016. (Photo by Alexandre Meneghini/Reuters)





People carry Cuban flags during a May Day rally in Havana, Cuba, May 1, 2016. (Photo by Alexandre Meneghini/Reuters)





A boy reacts as he carries a Chinese dragon during a May Day rally in Havana, Cuba, May 1, 2016. (Photo by Alexandre Meneghini/Reuters)





Dancers perform with stilts during a May Day rally in Havana, Cuba, May 1, 2016. (Photo by Alexandre Meneghini/Reuters)





A man holds a flag and carnation during a May Day march by the Portuguese union CGTP in Lisbon, Portugal, May 1, 2016. (Photo by Hugo Correia/Reuters)





Medical personnel hold a picture of Cuba's former President Fidel Castro during a May Day rally in Havana, Cuba, May 1, 2016. (Photo by Alexandre Meneghini/Reuters)





Demonstrators clash with riot police during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





A demonstrator climbs on a traffic light during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





Demonstrators clash with riot police vehicles during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





A demonstrator throws a molotov cocktail bomb against a store during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





A demonstrator hits a riot police vehicle during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





A demonstrator holds up a sign that reads “Luksic (A Chilean business man) Dies!” during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





A demonstrator is detained during a rally commemorating May Day in Santiago, Chile May 1, 2016. (Photo by Ivan Alvarado/Reuters)





Karina Garcia from Elmhurst, Queens, wears a Mexican flag as she takes part in a May Day International Workers Day Rally for Workers and Migrants in Union Square in Manhattan, New York, U.S., May 1, 2016. (Photo by Mike Segar/Reuters)





A masked demonstrator rides in a car during the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A demonstrator participates in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A demonstrator spray paints graffiti on a wall during the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





Demonstrators participate in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





Demonstrators participate in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A demonstrator participates in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A demonstrator participated in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





Demonstrators participate in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





Demonstrators participate in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A masked skateboarder participates in the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A demonstrator spray paints graffiti on a wall during the May Day march in San Salvador, El Salvador May 1, 2016. (Photo by Jose Cabezas/Reuters)





A demonstrator walks in front of riot policemen during May Day protests in Bogota, Colombia, May 1, 2016. (Photo by Jon Nazca/Reuters)





A demonstrator taken part during May Day protests in Bogota, Colombia, May 1, 2016. (Photo by Jon Nazca/Reuters)





Supporters of Venezuela's President Nicolas Maduro hold up a cardboard figure of him and Henry Ramos Allup, President of the National Assembly and deputy of the Venezuelan coalition of opposition parties (MUD) during a rally to commemorate May Day, in Caracas, Venezuela, May 1, 2016. (Photo by Marco Bello/Reuters)





A supporter of Venezuela's President Nicolas Maduro wearing glasses with the eyes of Venezuela's late President Hugo Chavez, holds postcards with pictures of them, during a rally to commemorate May Day, in Caracas, Venezuela, May 1, 2016. (Photo by Marco Bello/Reuters)





A supporter of Venezuela's President Nicolas Maduro holds a portrait of Venezuela's late President Hugo Chavez, during a rally to commemorate May Day, in Caracas, Venezuela, May 1, 2016. (Photo by Marco Bello/Reuters)





A supporter of Venezuela's President Nicolas Maduro holds a portrait of Venezuela's late President Hugo Chavez, during a rally to commemorate May Day, in Caracas, Venezuela, May 1, 2016. (Photo by Marco Bello/Reuters)