People attend a "Workers' Day concert" in Rome's Piazza San Giovanni on May 1, 2012.
Italy —
People attend a "Workers' Day concert" in Rome's Piazza San Giovanni on May 1, 2012.
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A protester holds a rose with a bubble on it in front of police at a rally for International Workers' Day in Oakland, California.
Oakland, California —
A protester holds a rose with a bubble on it in front of police at a rally for International Workers' Day in Oakland, California.
Getty Images
The May Day march through downtown Los Angeles marks International Workers' Day with workers, immigrant-rights activists and Occupy Wall Street protesters.
Los Angeles, California —
The May Day march through downtown Los Angeles marks International Workers' Day with workers, immigrant-rights activists and Occupy Wall Street protesters.
Getty Images
Occupy Wall Street participants gather for a May Day demonstration at Bryant Park in New York on Tuesday, May 1.
New York City —
Occupy Wall Street participants gather for a May Day demonstration at Bryant Park in New York on Tuesday, May 1.
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Militants and labor union members gather around a burning effigy of Philippine President Benigno Aquino in Manila.
The Philippines —
Militants and labor union members gather around a burning effigy of Philippine President Benigno Aquino in Manila.
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Protesters march during a May Day rally in central Istanbul.
Turkey —
Protesters march during a May Day rally in central Istanbul.
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A demonstrator wearing a French revolutionary Phrygian cap waves a flag of the French Front de Gauche (FG) leftist party during a march as part of the annual May Day workers' events o in Marseille, France.
France —
A demonstrator wearing a French revolutionary Phrygian cap waves a flag of the French Front de Gauche (FG) leftist party during a march as part of the annual May Day workers' events o in Marseille, France.
AFP/Getty Images
A young protester dons a "99" mask prior to a May Day protest in Hong Kong.
China —
A young protester dons a "99" mask prior to a May Day protest in Hong Kong.
AFP/Getty Images
A protester shouts slogans during a demonstration in central Athens to mark the May Day celebrations.
Greece —
A protester shouts slogans during a demonstration in central Athens to mark the May Day celebrations.
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A protester holds a placard that says "Protest, Is it Terrorism?" during a demonstration at the May Day rally in Barcelona.
Spain —
A protester holds a placard that says "Protest, Is it Terrorism?" during a demonstration at the May Day rally in Barcelona.
Protesters march during a May Day rally in central Stockholm.
Sweden —
Protesters march during a May Day rally in central Stockholm.
AFP/Getty Images
Indonesian workers march toward the presidential palace during May Day protests in Jakarta.
Indonesia —
Indonesian workers march toward the presidential palace during May Day protests in Jakarta.
AFP/Getty Images