United Steelworkers (USWA) is one of the largest labor unions in North America. It is affiliated with the American Federation of Labor and Congress of Industrial Organizations (AFL-CIO) and the Canadian Labour Congress (CLC). The USW has headquarters in Pittsburgh, Pennsylvania; Nashville; and Toronto, Canada. Its members work mainly in the steel, aluminum, paper, forestry products, tire and rubber, mining, glass, chemical, and petroleum industries. The union also includes people working in transportation, trades, and services. The union's official name is the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union. For the membership of the USW, see Labor movement.