The Unite Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union (United Steelworkers or USW) is the largest industrial labor union in North America, and claims over 1.2 million active and retired workers amongst its ranks. Headquartered in Pittsburgh, Pennsylvania, the United Steelworkers represents workers in the United States, Canada and the Caribbean. The United Steelworkers represent workers in a diverse range of industries, including primary and fabricated metals, chemicals, glass, rubber, heavy-duty conveyor belting, tires, transportation, utilities, container industries, pharmaceuticals, call centers and health care.