Paul McGonagle (Quincy, Massachusetts- November 1974 South Boston, Massachusetts) was an American mobster and leader of the Mullen Gang, a South Boston street crew involved in burglary and armed robbery. Paul McGonagle was the oldest of several brothers born to first generation Protestant immigrants from Ireland and raised in South Boston. While in South Boston he became acquainted with Catherine's sister Margaret and the two married, and moved into a home in the neighbourhood of Quincy where she lived during her marriage to the gang leader. During the gang war against neighborhood boss Donald Killeen, McGonagle and Irish immigrant Patrick Nee successfully led the Mullens against the Killeen brothers organization, which finally ended with Donald Killeen's gunned down outside his suburban home in 1972. The leadership of the Killeen Gang was then devolved on James "Whitey" Bulger. He is the former brother-in-law to Catherine Elizabeth Grieg, the fugitive girlfriend of Winter Hill Gang leader James J. Bulger. Later, Catherine and Margaret's younger brother became close friends with Bulger. Former reporter Howie Carr stated, "Whitey isn't exclusively gay.