Knowra Haymarket affair Haymarket affair The Haymarket affair was an 1886 labor rally in Chicago that ended in a bomb explosion and violence between police and demonstrators. The prosecutions that followed made it a landmark in labor and civil-liberties history.
Eight-hour day : A standard workday limited to eight hours, a central demand of nineteenth-century labor movements. Chicago workers gathered to press the demand that had brought labor organizers into conflict with employers.
Haymarket bombing : The 1886 explosion that killed a police officer during a Chicago labor rally and precipitated a violent clash. The bomb's explosion transformed the rally into the event remembered as the Haymarket affair.
Lucy Parsons : A labor organizer and radical speaker who campaigned against poverty, racism, and state repression. She organized publicly against the prosecution and later became a prominent labor activist.
Haymarket martyrs : The four men executed after the Haymarket trial, commemorated by labor movements as martyrs. Their executions turned the defendants into enduring symbols of labor struggle.
Haymarket bombing theories : Competing explanations of who threw the bomb at the 1886 Haymarket rally and why. No defendant was conclusively identified as the bomber, leaving responsibility contested.
McCormick Harvesting Machine Company : A Chicago manufacturer of agricultural machinery, known in 1886 for labor conflict at its factory. Police violence at a strike meeting outside its factory helped prompt the Haymarket rally.
Chicago Police Department : The municipal law-enforcement agency responsible for policing Chicago. Police advanced on the rally after ordering it to disperse, triggering gunfire and deaths.
Michael Schwab : A German-born labor organizer convicted in the Haymarket case and sentenced to death, later commuted. Schwab was among the defendants whose sentences became a focus of appeals for clemency.
May Day : An international workers' holiday observed on May 1, associated with labor rights and the eight-hour day. The Haymarket events helped inspire the choice of May 1 for international labor demonstrations.
Haymarket affair and the Molly Maguires : A secretive Irish-American labor organization accused of violence in Pennsylvania coal country during the 1870s. Both cases joined labor activism, alleged violence, and prosecutions whose fairness remains debated.
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