The GMP International Union (formerly the Glass, Molders, Pottery, Plastics and Allied Workers International Union) is a North American labor union, one of the constituent members of the AFL-CIO and of the Canadian Labour Congress. It is the result of a number of mergers of labor unions dating back to 1842, including the International Molders and Foundry Workers Union of North America; and claims over 250 union locals in those two countries. It is headquartered in Media, Pennsylvania. It publishes a magazine for its members called Horizon.
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