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
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