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International Workers' Day, held every year on May 1, is a celebration of labor and the global working class. But not all international workers have the same rights as those in more developed countries. Workers' organizations use this day to hold demonstrations to demand better rights, wages and conditions for the working class around the world.

In the photo above, laborers fill a pot with melted iron to pour into a casting mold to make machine parts in a foundry in Karachi, Pakistan, on Wednesday.

A worker walks through a salt pan on the eve of "May Day," or Labor Day, on the outskirts of the southern Indian city of Chennai on Wednesday.BABU / Reuters