Workers of the world, unite!

Cuban soldiers carry depictions of President Donald Trump during the annual May Day parade held at Revolution Square in Havana, Cuba. Trump claimed via Twitter that if Cuban troops and militia do not cease their operations in support of Venezuela immediately, Cuba would suffer "a full and complete embargo" as well as "highest-level sanctions." (Photo: AP)

Balloons and flags fly over the crowd as people prepare to walk on Red Square in Moscow, Russia, with the St Basil's Cathedral in the background. As in Soviet times, people paraded across Red Square on May Day, but instead of red flags with the Communist hammer and sickle, they waved the Russian tricolour. (Photo: AP)

Members of the Korean Confederation of Trade Unions hold up their banners during a May Day rally in Seoul, South Korea, with signs that read "Let's win the wage struggle." Thousands of trade union members and activists marked May Day by marching through Asia's capitals and demanding better working conditions and expanding labour rights. (Photo: AP)

Workers chant anti-government slogans outside the National Insurance Office during a demonstration marking International Workers' Day also known as May Day, in Port-au-Prince, Haiti. Workers demanded a minimum wage increase, from USD 5 per eight-hour work day to USD 20 per day. Women calling out to sex workers to unite during a May Day rally in front of 40 Wall Street, a Trump-owned property, in New York.Women calling out to sex workers to unite during a May Day rally in front of 40 Wall Street, a Trump-owned property, in New York. (Photo: AP)

Riot police officers walk along with marching right wing supporters following scuffles with left wing protesters in the city of Brno, Czech Republic. (Photo: AP)

A man dressed as President Donald Trump holds a golf club as he stands beside a person dressed as a corporate vulture during a May Day rally in front of 40 Wall Street, a Trump-owned property in New York. (Photo: AP)

A mask-wearing protester from Harlem Solidarity and Defense a group that opposes displacement due to gentrification of Harlem, joins other protesters during a May Day rally in front of 40 Wall Street, a Trump-owned property in New York. (Photo: AP)

Protesters opposed to the US position on Iran hold a sign as they joined others from a variety of causes during a May Day rally in front of 40 Wall Street, a Trump-owned property in New York. (Photo: AP)

Women calling out to sex workers to unite during a May Day rally in front of 40 Wall Street, a Trump-owned property in New York. (Photo: AP)

Demonstrators confront police officers as scuffles broke out during a May Day rally in Turin, Italy. (Photo: AP)

An injured demonstrator is helped during a May Day rally in Paris, France. Brief scuffles between police and protesters broke out in Paris as thousands of people gathered for the May Day rallies under tight security measures. (Photo: AP)

Left wing demonstrators burn bengals on a balcony during the traditional May Day demonstration in Berlin, Germany. (Photo: AP)