Union descriptions of tragic events in labor history. Examples include Chicago's Memorial Day Massacre where ten steelworkers were shot dead and over eighty were wounded by police on May 30, 1937. There was the Hilo, Hawaii, Massacre of 1938 where nearly fifty unionists were shot or bayonetted by police while sitting on a government pier protesting the unloading of a struck ship. Also, the Ludlow Massacre of 1914 which included the killing of eleven children and two women by the state militia.

Source: U.S. Department of Labor