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New Orleans police chief David Hennessy is murdered, allegedly by members of the Mafia. The subsequent trial and mob vigilantism makes international headlines.
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The Volstead Act becomes law, beginning Prohibition.
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The Castellammarese War occurs.
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St. Valentine's Day Massacre
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Prohibition is repealed.
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Abe Reles “falls” to his death from a Coney Island hotel window
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Frank Costello survives a botched hit. The raid on the Mafia conference on Apalachin, New York, gives the gangsters unwanted publicity. Carlo Gambino becomes the Boss of Bosses.
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Joe Colombo is shot at the Italian-American Unity Day he organized. He lingers in a vegetative state for years before dying.
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Carlo Gambino dies and is succeeded by Paul Castellano.
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Beginning of bloody Philly mob war.
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The feds arrest more than sixty members and associates of the Gambino family.