Joseph Albert "Jock" Yablonski (March 3, 1910 – December 31, 1969) was an American labor leader in the United Mine Workers in the 1950s and 1960s. He was murdered in 1969 by killers hired by a union political opponent, Mine Workers president W. A. Boyle. His death led to significant reforms in the union.
After listening to the entire Yablonski story, Sommersburg agreed that it was a worthy "myth". Shocked, Adducci replied that he was only eight at the time Yablonski was murdered. Adducci further described that his father had taken him to Yablonski's rally, and that he was photographed shaking Yablonski's hand.