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International Workers' Day2012
Wikipedia:
International Workers' Day (also known as May Day) is a celebration of
the international labour movement and left-wing movements.
It commonly sees organized street demonstrations and marches by working people
and their labour unions throughout most of the world.
May 1 is a national holiday in more than 80 countries.
It is also celebrated unofficially in many other countries.
International Workers' Day
Labour Day: Labour Day