This is the Haymarket Memorial at 175 North Desplaines Street, Chicago, Illinois. I am sorry to say that I never visited it personally myself although my father grew up within walking distance on Chicago’s near west side. There is a fine article on truthout.org on the Haymarket riot which was part of a general strike to reduce the working day to eight hours. The Haymarket riot which was a police riot occurred on May 4, 1886. The eight-hour day was not achieved until 1938, which was 52 years later. May 1 or May Day celebrating labor was the response to the Haymarket riot
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