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Jack Whalen (died December 2, 1959), also called Jack O'Hara and "The Enforcer," was a freelance contract killer and bookie, who most often worked for the Los Angeles crime family, although he also was associated with Benjamin "Bugsy" Siegel, the Shannon brothers (Joe, Izzy, Moe, and Max were the names of the Shannon brothers; also known as the Shaman brothers  retrieved June 24, 2013) and Mickey Cohen during the 1940s and 1950s.
Jack F. Whalen was born in Missouri. Whalen's father Fred—who was also a career criminal—had enrolled Jack in military school to give his son a better life. Jack played polo in school and piloted bombers in World War II. After the war, he married into a rich family in Los Angeles; however, by 1955, his own criminal career had begun. He was soon called "The Enforcer" because he was "so tough he didn't need a gun."
He was eventually shot "square between the eyes" and killed at Rondelli's in Sherman Oaks by Sam Frank LoCigno, in the presence of Mickey Cohen and three other of his associates, who with LoCigno were charged and later acquitted of his murder.
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