Thousands take part in May Day rallies across the globe
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May Day protesters demand better rights for workers
Each year, people around the world take to the streets to mark International Workers' Day, or May Day.
May 1 is a public holiday in many countries, though activities are restricted in some places, leading on some occasions to street confrontations.
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May Day protesters demand better rights for workers
Demonstrators across the globe took to the streets on Tuesday to demand better working conditions, as part of rallies marking International Workers' Day.
Held on May 1 each year -- known as May Day -- the rallies date back to the 1880s.
At the time, labor movements around the world were campaigning for safeguards such as eight-hour workdays and trade unions. The date of May 1 was chosen as it coincided with the anniversary of the Haymarket affair in Chicago, where police killed four people at a peaceful protest after someone threw a bomb into the crowd.