To this day, the exact fate of Jimmy Hoffa, one of the most corrupt and forceful US union leaders, remains a mystery. Hoffa had built up the Teamsters Union into a massive and rich organisation with close links to organised crime. Brought to trial in 1962 and finally imprisoned in 1967, he was pardoned by Richard Nixon in 1971. Four years later he was lured to a fictitious union meeting and disappeared.
