Protests were held in cities around the world on May Day.
Protests in Paris turned violent when police officers were burned.
Demonstrators in Paris confront police officers.
In Rio de Janeiro, Brazil, demonstrators protest against the government's proposed pension reforms.
In Hamburg, Germany, protesters carry signs condemning the upcoming G20 Summit in a May Day march.
Demonstrators hold up a sign that reads "Liberation and Solidarity International" as they march during a protest in Kreuzberg District of Berlin.
Protesters use smoke grenades at they march during the "Revolutionary 1st of May" demonstration.
An injured protester is escorted by first responders in Berlin.
Berlin protesters ignite smoke bombs during a May Day protest in the Kreuzberg District.
Dozens were arrested in Portland, Oregon, protests.
Protesters march to Los Angeles City Hall.
May Day protesters stand over the 110 Freeway in LA.
Hundreds of people gather in New York City's Union Square for May Day protests.
A person in a mask at the demonstration in New York City.
A counter-protester is removed from a May Day rally in New York City after demonstrators accused him of making racist comments.
Jennifer Molina waves a flag in downtown Seattle during the Workers and Immigrant Rights March.
Seattle police officers arrest a protester.
Protesters gathered at Dupont Circle in Washington, D.C.
People in Washington, D.C. gathered to denounce President Trump's immigration policies in a May Day march.
Protesters walk through streets in downtown Chicago.
A protester holds a sign at a May Day event in Chicago.
Protesters paint a mural outside the U.S. Immigration and Customs Enforcement office in San Francisco.
Native American dancers join a May Day demonstration in San Francisco.
People hold a sign during a May Day march on the Las Vegas Strip.
Union members Nympha Camacho, Glenna Bolster and Vernisha Ward (L-R) take part in a march in Las Vegas.