Joseph Albert "Jock" Yablonski, a 59-year-old male of Polish-American ethnicity, was a prominent labor leader and candidate for the presidency of the United Mine Workers of America . He lived in Clarksville, Pennsylvania. Yablonski was known for his efforts to reform the UMWA and challenge the incumbent president, W.A. "Tony" Boyle, whom he accused of corruption and nepotism.
On New Year's Eve 1969, Yablonski, his wife Margaret, and their 25-year-old daughter Charlotte were murdered in th
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