Undercover Billy joins us for a second segment as he dives into the fight for Mafia leadership in the New England area. Plus, the return of Joe B., and the real story of Massachusetts State Police Col. Chris Mason and the Globe's inaccurate depiction of his alleged wrongdoings.

Kill or be Killed: The Struggle to lead the Mafia in Boston

Former Massachusetts State Police Captain Joe "Buddy" Saccardo explains what motivated him to become a Trooper, and what life was like in the MSP in the early 1960's. We follow his career - and what led him to investigate one of Massachusetts' most famed "killers," and how he lied about being a prolific murderer for Whitey Bulger and the Winter Hill gang.

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Kill or be Killed: The Struggle to lead the Mafia in Boston

Kill or be Killed: The Struggle to lead the Mafia in Boston