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The identity of the hit men is a mystery to most of the Mafia too. Some Mob insiders believe they are a squad of "greenies"—gunmen lately brought illegally into this country from Sicily. Others say the .22 hits are the work of young Viet Nam War vets. Still other sources pin the killings on two seasoned triggermen of New York Drug King Carmine Galante. Whoever they are, they have brought the silenced .22 loud notoriety.