The Amalgamated Association of Iron and Steel Workers (AAISW) was a labor union in the United States that represented workers in the iron and steel industry. Founded in 1876, it aimed to improve working conditions, wages, and job security for its members. The union played a significant role in advocating for workers' rights during a time of rapid industrialization. Throughout its history, the AAISW engaged in various strikes and negotiations to secure better labor agreements. It eventually merged with other unions, contributing to the formation of larger organizations like the United Steelworkers in 1942, which continues to represent steelworkers today.