On Memorial Day 1937, thousands of steelworkers, middle-class supporters, and working-class activists gathered at Sam's Place on the Southeast Side of Chicago to protest Republic Steel's virulent opposition to union recognition and collective bargaining. By the end of the day, ten marchers had been mortally wounded and more than one hundred badly injured, victims of a terrifying police riot. Sam's Place, the headquarters for the steelworkers, was transformed into a bloody and frantic triage unit