Anti-riot police walk past a buring barricade as they clash with protesters during a May Day demonstration in Paris, on May 1, 2019. Paris riot police fired teargas as they squared off against hardline demonstrators among tens of thousands of May Day protesters, who flooded the city in a test for France's zero-tolerance policy on street violence. (Photo by Anne-Christine Poujoulat/AFP Photo)





Communist party supporters march with a flag depicting Soviet Union founder Lenin during a May Day rally in St.Petersburg, Russia, Wednesday, May 1, 2019. (Photo by Dmitri Lovetsky/AP Photo)





Police officers arrest a left wing demonstrator during the traditional May Day demonstration in Berlin, Germany, Wednesday, May 1, 2019. (Photo by Markus Schreiber/AP Photo)





A protester speaks through a megaphone as smoke from coloured smoke bombs billows near people taking part in the annual May Day rally in Strasbourg, eastern France, on May 1, 2019. (Photo by Patrick Hertzog/AFP Photo)





Riot police officers patrol during a May Day demonstration in Paris, Wednesday, May 1, 2019. French authorities announced tight security measures for May Day demonstrations, with the interior minister saying there was a risk that “radical activists” could join anti-government yellow vest protesters and union workers in the streets of Paris and across the country. (Photo by Francois Mori/AP Photo)





Indian members of the federation of the trade Unions Delhi committee shout slogans and attend a rally to mark the International Labor Day in New Delhi, India, 01 May 2019. Labor Day or May Day is observed all over the world on the first day of the month of May to celebrate the economic and social achievements of workers and fight for laborers rights. (Photo by Rajat Gupta/EPA/EFE)





Riot police clash with protesters of the No Tav movement (against the Turin–Lyon high-speed TAV railway line) in Turin, during one of several demonstrations against unemployment as part of May Day rallies on May 1, 2019. (Photo by Marco Bertorello/AFP Photo)





A worker holds a flag during a May Day protest near the National Monument (Monas) in Jakarta, Indonesia, May 1, 2019. (Photo by Willy Kurniawan/Reuters)





Police detain a protester after marching on Taksim Square to celebrate May Day in Istanbul, Turkey May 1, 2019. (Photo by Murad Sezer/Reuters)





Police officers prevent demonstrators from marching during a May Day protest on Labour Day in Algiers, Algeria on May 1, 2019. (Photo by Ramzi Boudina/Reuters)





Supporters of Venezuelan opposition leader Juan Guaido, who many nations have recognized as the country's rightful interim ruler, hold a giant Venezuelan flag as they take part in a rally against the government of Venezuela's President Nicolas Maduro and to commemorate May Day in Caracas, Venezuela on May 1, 2019. (Photo by Manaure Quintero/Reuters)





A look-alike of Adolf Hitler from the Netherlands attends a march of far-right supporters of the party “Die Rechte (The Rights)” during a May Day rally through the streets of Duisburg, Germany on May 1, 2019. (Photo by Wolfgang Rattay/Reuters)





Police use pepper spray during a left wing May Day demonstration in Berlin, Germany on May 1, 2019. (Photo by Hannibal Hanschke/Reuters)





Masked protesters burn street furniture during clashes with riot police as part of the traditional May Day labor union march with French unions and yellow vests protesters in Paris on May 1, 2019. (Photo by Gonzalo Fuentes/Reuters)





A performer participates in a May Day rally in San Salvador, El Salvador on May 1, 2019. (Photo by Jose Cabezas/Reuters)





Police officers detain an opposition protester during a May Day rally in Saint Petersburg, Russia on May 1, 2019. (Photo by Igor Russak/Reuters)





Supporters of the Russian Communist party take part in a May Day rally in Krasnoyarsk, Russia on May 1, 2019. (Photo by Ilya Naymushin/Reuters)





Czech riot police officers detain a protester during a May Day rally in Brno, Czech Republic on May 1, 2019. (Photo by David W. Cerny/Reuters)





People carry communist flags during a May Day rally in Pamplona, northern Spain, Wednesday, May 1, 2019. Spain's workers are marching in its major cities to make their voices heard days before acting Prime Minister Pedro Sanchez starts negotiating with other parties to form a new government. (Photo by Alvaro Barrientos/AP Photo)





Workers wear masks during a May Day rally in Jakarta, Indonesia, Wednesday, May 1, 2019. Thousands of workers attended the rally urging the government to raise minimum wages, ban outsourcing practices, provide free health care and improve working condition for workers in the country. (Photo by Achmad Ibrahim/AP Photo)





Left wing demonstrators burn bengals on a balcony during the traditional May Day demonstration in Berlin, Germany, Wednesday, May 1, 2019. (Photo by Markus Schreiber/AP Photo)





A member of the Economic Freedom Fighters (EFF) party attends a May Day Rally in Alexandra Township, Johannesburg, Wednesday, May 1, 2019. In South Africa, the Economic Freedom Fighters opposition party used the day to rally voters a week before the country's national election. Wearing their signature red shirts and berets, members gathered at a stadium in Johannesburg in cheering support of populist stances that have put pressure on the ruling African National Congress to address issues like economic inequality and land reform. (Photo by Themba Hadebe/AP Photo)





Demonstrators confront police officers as scuffles broke out during a May Day rally in Turin, Italy, Wednesday, May 1, 2019. (Photo by Alessandro Di Marco/ANSA via AP Photo)





A man walks past garbage that was put on fire in Paris, Wednesday, May 1, 2019. Brief scuffles between police and protesters have broken out in Paris as thousands of people gather for May Day rallies under tight security measures. (Photo by Francois Mori/AP Photo)





Riot police officers walk along with marching right wing supporters following scuffles with left wing protesters in the city of Brno, Czech Republic, Wednesday, May 1, 2019. (Photo by Petr David Josek/AP Photo)





An injured demonstrator is helped during a May Day rally in Paris, Wednesday, May 1, 2019. Brief scuffles between police and protesters have broken out in Paris as thousands of people gather for May Day rallies under tight security measures. (Photo by Francois Mori/AP Photo)





Communist party supporters carry a flag depicting Soviet Union founder Lenin during a May Day rally in St.Petersburg, Russia, Wednesday, May 1, 2019. (Photo by Dmitri Lovetsky/AP Photo)