<table bgcolor="#ffffff" border="0" cellpadding="2" cellspacing="0" width="100%"><tbody><tr><th colspan="2" align="left">Photos: Iranian Workers </th></tr> <tr><td colspan="2">Photos by Sajad Avarand, ISNA (http://www.isna.ir/)
In many countries, May Day is synonymous with International Workers' Day (http://en.wikipedia.org/wiki/International_Workers%27_Day), or Labour Day (http://en.wikipedia.org/wiki/Labour_Day), which celebrates the social and economic achievements of the labour movement. May Day commonly sees organized street demonstrations and street marches by millions of working people and their labour unions throughout most of the countries of the world.

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Related Article: Iran: end repression of independent trade unions (http://www.payvand.com/news/09/may/1004.html)