Thousands of Communist supporters march through Moscow, Russia.
Some 15,000 students and members of the Korean Confederation of Trade Unions rally in Seoul on Saturday to demand better working conditions and that no troops be sent to Iraq.
Shadows fall on a flag of the left-wing organization Avant-garde of the Communist Youth during May Day events in Moscow on Saturday. Thousands of people from various parties and trade unions participated in May Day demonstrations across Russia.
An estimated 1,500 pro-democracy demonstrators march through downtown Hong Kong on Saturday with heart-shaped signs that read, "My wish, my right." The marchers demanded labor rights, minimum wages and full democracy.
Tens of thousands of people visit Tiananmen Square on Saturday, where a portrait of Sun Yat-sen is put up every year to mark May Day. Sun Yat-sen is considered the founding father of new China and is honored on the day communist countries honor their workers.
Members of a left-wing workers' party campaign for congressional seats in the May 10 national elections during International Labor Day events in Manila.
Around 6,000 sex workers participate in a procession in West Bengal, shouting "Rights of work for sex workers" late Friday.
Hundreds of workers took part in May Day events aimed at fighting poverty, workplace discrimination and violence in Zimbabwe. Nearly 70 percent of the country's population is unemployed.
Riot police detain a man on Saturday in Istanbul, where May Day demonstrations pushed for greater rights for Kurds, protested against NATO and demanded more rights for workers. Scores of people were detained in protests throughout the country.
Some 5,000 people march in central Madrid's May Day rally, chanting "No to terrorism" in response to the bloody train bombings in Madrid.
French President Jacques Chirac smells a bouquet of lily of the valley during the May Day ceremonies at the Elysee Palace. Traditionally, May Day is also a celebration of spring.
Cuban President Fidel Castro waves a Cuban flag during a speech at Revolution Plaza. Earlier this week, a Cuban labor leader declared that the country's May Day celebrations would be dedicated to showing the United States that Cuba is committed to socialism, not moving toward U.S.-style democracy.