When mobsters wanted a particularly ruthless job done in the 1920s and 30s, their go-to man was Vincent "Mad Dog" Coll. Vincent would kidnap or kill anyone, from Hell's Angels leader "Big Frenchy" DeMange to Broadway singer Rudy Vallee. 

Parcasters - Did you catch Unexplained Mysteries yesterday?  You won’t want to miss the case of the disappearing genius, Physicist Ettore Majorana, a supposed time traveler! Available now at parcast.com/unexplained

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