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Membership Certificate, Amalgamated Association of Iron, Steel and Tin Workers, Lodge 194, Rankin, PA , 1933.
Credit: Archives and Labor Collection, Archives Service Center, University of Pittsburgh
Found in 1876 through the merger of three existing ironworkers unions, the Amalgamated Association by 1891 had 25,000 members in 290 lodges, making it one of the largest most powerful unions in the country.