The Valachi Papers

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The movie begins in the Atlanta Federal Penitentiary, where an aging prisoner named Joseph Valachi Charles Bronson is imprisoned for smuggling heroin. The boss of his crime family, Vito Genovese Lino Ventura, is imprisoned there as well. Genovese is certain that Valachi is an informant, and gives him the kiss of death. Valachi kisses him back.Valachi mistakenly kills a fellow prisoner who he wrongly thinks is a mob assassin. Told of the mistake by federal agents, Valachi becomes an informant, mistakenly recognized as the first in the history of the American mafia. He tells his life story in flashbacks. ........

Source: Wikipedia