Note 3 — Chapter XII · A KNOCK AT THE DOOR AT 2 A. M.
Reading edition
Lieutenant Joseph Petrosino of the Italian Detective Bureau, attached to the New York Police Department, was murdered in Palermo, Sicily, while on a mission for the Police Department then under the guidance of Commissioner Theodore Bingham. Petrosino had been an implacable foe of the Lupo-Morello gang. His murder has never been explained to the public.