The Ciaculli massacre on 30 June 1963 was caused by a car bomb that exploded in Ciaculli, an outlying suburb of Palermo, killing seven police and military officers sent to defuse it after an anonymous phone call. The bomb was intended for Salvatore "Ciaschiteddu" Greco, head of the Sicilian Mafia Commission and the boss of the Ciaculli Mafia family. Mafia boss Pietro Torretta was considered to be the man behind the bomb attack.

The Sicilian Mafia Commission, known as Commissione or Cupola, is a body of leading Sicilian Mafia members who decide on important questions concerning the actions of, and settling disputes within the Sicilian Mafia or Cosa Nostra. It is composed of representatives of a mandamento who are called capo mandamento or rappresentante. The Commission is not a central government of the Mafia, but a representative mechanism for consultation of independent Mafia families who decide by consensus. Its primary role is to keep the use of violence among families within limits tolerable to the public and political authorities.