Jack Whalen

Jack Whalen (May 11, 1918 – December 2, 1959), also called '''Jack O'Hara''' and "The Enforcer," was a criminal and freelance contract killer and bookie, who worked for the Los Angeles crime family, although he also was associated with Benjamin "Bugsy" Siegel, the Shannon brothers (Joe, Izzy, Moe, and Max) and Mickey Cohen during the 1940s and 1950s. Provided by Wikipedia