Factual errors: The other boss prominent in the 'Castellammarese War', was Salvatore Maranzano. However, in the movie his name has been changed to Salvatore Faranzano played by Michael Gambon as a mob boss who had terrorized Luciano's neighbourhood for over 15 years. The real Maranzano was only 34 years old when he was shot and stabbed to death. The movie depicts the fictional 'Farenzano' is a much older man who was thrown from an upper story window to his death.
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