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http://en.wikipedia.org/wiki/May_Day


May Day is a name for various holidays celebrated on May 1 (or in the beginning of May).

Labour association

May Day rallies, such as this one in Mumbai, are common.The holiday is most often associated with the commemoration of the social and economic achievements of the labor movement. The May 1st date is used because in 1884 the Federation of Organized Trades and Labor Unions demanded an eight-hour workday in the United States, to come in effect as of May 1, 1886. This resulted in the general strike and the U.S. Haymarket Riot of 1886, but eventually also in the official sanction of the eight-hour workday.

May Day is designated International Workers Day. It is indeed a thoroughly international holiday; and the United States is one of the few countries in the world where pressure from local working classes has not led to an official holiday. In the 20th century, the holiday received the official endorsement of the Soviet Union; celebrations in communist countries during the Cold War era often consisted of large military parades and shows of common people in support of the government.

There is some suggestion that Labor Day in the United States was created specifically to avoid commemoration of May Day. The adoption of May Day by communists and socialists as their primary holiday cements official resistance to Labor Day and similar non-May Day celebrations, which they view as being controlled by the ruling class.