Joseph Yablonski
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.
Read more about Joseph Yablonski: Early Life and Union Career, UMWA Presidential Candidacy, Murder, Aftermath of Yablonski's Murder, Portrayal in Popular Culture