Bernardo Provenzano (Italian pronunciation: [ber'nardo proven'tsa?no]; 31 January 1933 – 13 July 2016) was an Italian mobster and chief of the Sicilian Mafia clan know as the Corleonesi, a Mafia faction that originated in the town of Corleone, and de facto capo dei capi (boss of all bosses) of the Sicilian Mafia until his arrest in 2006.
His nickname was Binnu u tratturi (Sicilian for "Bernardo the tractor") because, in the words of one informant, "he mows people down." Another nickname was il ragioniere ("the accountant") 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.