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A memorial to the persons who died in the Memorial Day massacre of 1937 is located at the union hall of United Steelworkers of America Local 1033 at 11731 Avenue O, Chicago. When Republic Steel refused to recognize the Steelworkers Organizing Committee, supporters from around Chicago gathered at the union's headquarters on Memorial Day 1937 and marched toward the Republic Steel mill. Police tried to stop the march and fired into the crowd killing 10 people and pursuing fleeing demonstrators.