Paulie McGonagle was the head of the Mullens, the gang that rivaled the Killeens when Whitey was an ex-con fresh out of Leavenworth. One of McGonagle’s brothers was murdered by mistake, and in revenge, the McGonagle crew killed Billy O’Sullivan, another of Donnie Killeen’s enforcers. After Whitey murdered Killeen and took over, he never forgot how he’d been hunted. In 1974, with help from Tommy King, he murdered McGonagle and then buried his body on Tenean Beach in Dorchester, after dumping his car and wallet off a pier in Charlestown. His body wasn’t found for a quarter-century. His sister-in-law, by the way, was Catherine Greig, who went on to become Whitey’s moll and is still on the lam with him today.