Verkkothe controversial american union leader, jimmy hoffa, was last seen alive on july 30 1975.

Verkkointerviews with a former mob lawyer, a murder witness, and an fbi agent are among the sources history detectives unearth as they track jimmy hoffaโ€™s final hours and.

He is believed to have been killed by the mafia.

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Verkkofbi agents have searched a plot of land in the us state of new jersey after a deathbed confession renewed hope of solving union boss jimmy.

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