United Workers Cooperatives was created in 1926.
United States Federation of Worker Cooperatives was created in 2004.
Workers United was created in 2009.
United Garment Workers was created in 1891.
United Farm Workers was created in 1962.
United Mine Workers was created on 1890-01-22.
Rural Cooperatives was created in 1934.
Workers Party of the United States was created in 1934.
Workers' Council of the United States was created in 1920.
United Public Workers of America was created in 1946.
United Federal Workers of America was created in 1937.
United Socialist Workers' Party was created in 1993.
United Steel Workers of Montreal was created in 2004.