Activists clash with riot police during the traditional May Day rally in the center of Paris, France, Tuesday, May 1, 2018. Each year, people around the world take to the streets to mark International Workers' Day, or May Day. (Photo by Francois Mori/AP Photo)





Female police officers detain a woman taking part in May Day protests in Istanbul, Turkey, May 1, 2018. Police detained several demonstrators as the crowd tried to march toward Istanbul's Taksim Square, which is symbolic as the center of protests in which dozens of people were killed in 1977.(Photo by Lefteris Pitarakis/AP Photo)





A McDonald's restaurant is hit with petrol bombs thrown by activists during the traditional May Day rally in the center of Paris, France, May 1, 2018. Each year, people around the world take to the streets to mark International Workers' Day, or May Day. (Photo by Francois Mori/AP Photo)





Demonstrators vandalize a bank during clashes at a rally marking May Day in Santiago, Chile May 1, 2018. (Photo by Ivan Alvarado/Reuters)





Russian opposition activist Sergey Udaltsov, foreground, leads a group of his supporters during a Communist rally to mark May Day in Moscow, Russia, May 1, 2018. More than 100,000 people came out on the streets on Moscow to march in the traditional May Day parade. The banner behind him reads “Communism instead of Putin”. (Photo by Alexander Zemlianichenko/AP Photo)





A disguised protestor attends a rally to mark the International Labor Day, in Zurich, Switzerland, on May 1, 2018. (Photo by Patrick Huerlimann/Keystone via AP Photo)





A man looks on next to an image of Karl Marx during a May Day rally organized by Front Line Socialist Party in Colombo, Sri Lanka May 1, 2018. (Photo by Dinuka Liyanawatte/Reuters)





Protesters dressed as clowns wipe the windows of a Swiss police car before a May Day demonstration in Zurich, Switzerland May 1, 2018. (Photo by Arnd Wiegmann/Reuters)





A car burns outside a Renault automobile garage during clashes during the May Day labour union march in Paris on May 1, 2018. (Photo by Christian Hartmann/Reuters)





A child sits o a man's shoulders as they attend a May Day rally in central Moscow, Russia on May 1, 2018. (Photo by Maxim Shemetov/Reuters)





People carry a banner in front of St. Basil's Cathedral during a May Day rally at Red Square in Moscow, Russia on May 1, 2018. (Photo by Maxim Shemetov/Reuters)





A supporter of the far-right National-Radical Camp (ONR) protests in Warsaw, Poland on May 1, 2018. (Photo by Dawid Zuchowicz/Reuters/Agencja Gazeta)





Members of the Neo-nazi Nordic Resistance Movement march through the town of Ludvika, Sweden on May 1, 2018. The march was opposed by anti-fascist groups and the local police, reinforced from other parts of Sweden, kept the groups apart. (Photo by Ulf Palm/Reuters/TT News Agency)





Army soldiers carry flags during the May Day rally in Havana, Cuba on May 1, 2018. (Photo by Alexandre Meneghini/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 Istanbul, Turkey on May 1, 2018. (Photo by Murad Sezer/Reuters)





People attend a May Day rally at Red Square in Moscow, Russia on May 1, 2018. (Photo by Maxim Shemetov/Reuters)





A couple dressed in historical military uniforms dances during May Day celebrations in central Moscow, Russia on May 1, 2018. (Photo by Maxim Shemetov/Reuters)





Protesters watch the burning of an effigy of President Rodrigo Duterte during a May Day rally, outside the Malacanang Presidential Palace in Mendiola, Metro Manila, Philippines on May 1, 2018. (Photo by Romeo Ranoco/Reuters)





Workers push police officers to brake the barricade during a Mayday rally at business district in Jakarta, Indonesia on May 1, 2018. (Photo by Reuters/Beawiharta)





A protester holds a smoke safety flare during the May Day labour union march in Paris on May 1, 2018. (Photo by Christian Hartmann/Reuters)





Turkish police detain protesters as they attempted to defy a ban and march on Taksim Square to celebrate May Day in Istanbul on May 1, 2018. (Photo by Murad Sezer/Reuters)





Protesters hold banners, flags and shout slogans during a May Day rally in Ankara, Turkey on May 1, 2018. (Photo by Umit Bektas/Reuters)





Demonstrators set up flares during a demonstration of leftists ahead the vigil of May Day demonstrations in Berlin on May 1, 2018. (Photo by Fabrizio Bensch/Reuters)





Police detain a man during a May Day protest against austerity measures, in San Juan, Puerto Rico May 1, 2018. (Photo by Alvin Baez/Reuters)





A chained activist, with his body painted in black, lifts a fake stone bearing the name of French President Emmanuel Macron and the word “people” on his torso as he poses for photographers while a digger set ablaze by demonstrators is seen on background during the traditional May Day rally in the center of Paris, France, Tuesday, May 1, 2018. Each year, people around the world take to the streets to mark International Workers' Day, or May Day. (Photo by Francois Mori/AP Photo)





Two elderly men carry portraits of Soviet founder Vladimir Lenin, right, and former Soviet leader Josef Stalin during a Communist rally to mark May Day in Moscow, Russia, May 1, 2018. Workers and activists marked May Day on Tuesday with rallies to demand their government address labor issues. (Photo by Alexander Zemlianichenko/AP Photo)





A participant of the traditional May Day celebrations, organized by the Austrian Social Democrats, SPOE, and trade unions wearing a horror mask in Vienna, Austria, May 1, 2018. (Photo by Ronald Zak/AP Photo)





Laborers from various unions rally to mark the May Day (International Workers' Day) in front of the Presidential Palace in Jakarta, Indonesia on May 1, 2018. (Photo by Eko Siswono Toyudho/Anadolu Agency/Getty Images)





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 Istanbul, Turkey May 1, 2018. (Photo by Murad Sezer/Reuters)





Vehicles are burning as thousands of people take to the streets during the May Day demonstrations on May 1, 2018 in Paris, France. This month celebrates the 50th anniversary of May 68 when France seen millions of students and striking workers, come onto the streets in demonstrations that changed the country. (Photo by Jeff J. Mitchell/Getty Images)