Sixty thousand unemployed workers rally at a Pittsburgh stadium - 1931
United Mine Workers reformer Joseph "Jock" Yablonski, his wife and daughter are murdered by hit men hired by union president Tony Boyle, who was to be convicted of the crime and eventually die in prison - 1969OSHA adopts a grain handling facilities standard to protect 155,000 workers at nearly 24,000 grain elevators from the risk of fire and explosion from highly combustible grain dust - 1987
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