[Answer] 5. Son of a coal miner, he rose to be head of the Teamsters' Union. He was often abusive and aggressive. He disappeared in 1975.

Step 1 : Introduction to the question "5. Son of a coal miner, he rose to be head of the Teamsters' Union. He was often abusive and aggressive. He disappeared in 1975."

...1. Jimmy Hoffa 2. John L. Lewis 3. Eugene V. Debs 4. Walter Ruether Hoffa left his coal mining family for Detroit as a young man and quickly became a union activist culminating as president of the Teamsters' Union. Because of illegal activities, he was sentenced to fifteen years in prison in 1964 but was later pardoned by President Nixon. He disappeared in 1975 and is believed to have been murdered by the Mafia. There have been 'confessions' by some mobsters but none is considered valid.

Step 2 : Answer to the question "5. Son of a coal miner, he rose to be head of the Teamsters' Union. He was often abusive and aggressive. He disappeared in 1975."

Jimmy Hoffa:

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