Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Dan Moldea, perhaps the nation's most prominent Hoffa expert. He started reporting on the teamsters, and Hoffa, in his early twenties. He was beaten up in the process... and in 1978 wrote the landmark book, "The Hoffa Wars: Teamsters, Rebels, Politicans and the Mob."

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