The Second Mafia War was a period of conflict involving the Sicilian Mafia, mostly taking place from 1981 to 1984 and involved thousands of homicides. Sometimes referred to as The Great Mafia War or the Mattanza, it involved the entire Mafia and radically altered the power balance within the organization. In addition to the violence within the Mafia itself, there was violence against the state, including a campaign of deliberate assassinations of judges, prosecutors, detectives, politicians, activists and other ideological enemies. In turn, the war resulted in a major crackdown against the Mafia, helped by the pentiti, Mafiosi who collaborated with the authorities after losing so many friends and relatives to the fighting. In effect, the conflict helped end the secrecy of the Mafia.

Bernardo Provenzano was an Italian mobster and chief of the Sicilian Mafia clan known as the Corleonesi, a Mafia faction that originated in the town of Corleone, and de facto the boss of bosses. His nickname was Binnu u tratturi because, in the words of one informant, "he mows people down". Another nickname was il ragioniere, due to his apparently subtle and low-key approach to running his crime empire, at least in contrast to some of his more violent predecessors.