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 Matt Birkbeck, an award-winning investigative journalist and author, who was a reporter for The Morning Call in northeastern Pennsylvania, which gave him a ring-side seat to the Bufalino crime family. He wrote the book about its boss, called "The Quiet Don: The Untold Story of Mafia Kingpin Russell Bufalino."

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