William S. O'Sullivan (January 31, 1928, South Boston, Massachusetts — March 28, 1971, Dorchester, Massachusetts) was an Irish-American loanshark and longtime enforcer for Donald Killeen, the head of the Irish mob in South Boston, Massachusetts. O'Sullivan also acted as a mentor to a young James J. Bulger, who grew up to become the leader of Boston's Winter Hill Gang.
Read more about William S. O'Sullivan: Biography, The Mullin-Killeen War, Murder Victim, Aftermath
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