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The USW was established May 22, 1942, in Cleveland, Ohio, through the Congress of Industrial Organizations (CIO) by a convention of representatives from the Amalgamated Association of Iron, Steel, and Tin Workers and the Steel Workers Organizing Committee, after almost six years of divisive struggles to create a new union of steelworkers. The drive to create this union included such violent incidents as the infamous Memorial Day, 1937, when Chicago policemen supporting the rival American Federation of Labor (AFL) fired on workers outside a Republic Steel mill and killed 10 men.