Teamsters Union leader Jimmy Hoffa began a eight-year prison sentence on March 7, 1967, following his conviction for fraud and jury tampering

Hoffa’s imprisonment marked a dramatic fall for one of America’s most powerful labor leaders. (He would be released early in 1971 when President Nixon commuted his sentence.) Mysteriously, Hoffa later vanished in 1975 and was presumed murdered – a still-unsolved case that has become American criminal lore.