Michele Greco (Ciaculli, 12 May 1924 – Rome, 13 February 2008) was a member of the Sicilian Mafia, previously incarcerated for multiple murders.
 His nickname was "il Papa" (The Pope) because of his ability to mediate between different Mafia families.
 Greco was the head of the Sicilian Mafia Commission.
Salvatore Cancemi (Palermo, March 19, 1942 – January 14, 2011) was a member of the Sicilian Mafia.
 He would be the first member of the Sicilian Mafia Commission that turned himself in voluntarily and became a pentito, a collaborator with the Italian judicial authorities.
 Cancemi made controversial allegations about the collusion of Prime Minister Silvio Berlusconi and his right-hand man Marcello Dell'Utri with the Mafia, which have not been corroborated.
Bernardo Provenzano (] ; 31 January 1933 – 13 July 2016) was a member of the Sicilian Mafia ("Cosa Nostra") and was suspected of having been the head of the Corleonesi, a Mafia faction that originated in the town of Corleone, and de facto "capo di tutti capi" (boss of all bosses) of the entire Sicilian Mafia until his arrest in 2006.
The Sicilian Mafia Commission, known as Commissione or Cupola, is a body of leading Sicilian Mafia members to 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 (a district of three geographically contiguous Mafia families) that 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.
 "Contrary to the wide-spread image presented by the media, these superordinate bodies of coordination cannot be compared with the executive boards of major legal firms.
 Their power is intentionally limited [and] it would be entirely wrong to see in the Cosa Nostra a centrally managed, internationally active Mafia holding company," according to criminologist Letizia Paoli.
Angelo La Barbera (July 3, 1924 – October 28, 1975) was a powerful member of the Sicilian Mafia.
 Together with his brother Salvatore La Barbera (Palermo, April 20, 1922 – January 17, 1963) he ruled the Mafia family of Palermo Centro.
 Salvatore La Barbera sat on the first Sicilian Mafia Commission that was set up in 1958 as the capo mandamento for Mafia families of Borgo Vecchio, Porta Nuova and Palermo Centro.
Salvatore La Barbera (Palermo, April 20, 1922 – January 17, 1963) was a Sicilian mafioso.
 Together with his brother Angelo La Barbera he ruled the Mafia family of Palermo Centro.
 Salvatore La Barbera sat on the first Sicilian Mafia Commission that was set up in 1958 as the capo mandamento for Mafia families of Borgo Vecchio, Porta Nuova and Palermo Centro.
 La Barbera disappeared during the First Mafia War, a victim of the "lupara bianca", never to be seen again.
Antonio Geraci (Partinico, January 2, 1917 – Partinico, February 6, 2007), better known as Nenè or "il vecchio" (the old one), is the historical boss of the Mafia in Partinico, in the province of Palermo.
 Geraci sat on the Sicilian Mafia Commission since the mid-1970s and belonged to the hard line faction allied with the Corleonesi of Totò Riina and Bernardo Provenzano.
 According to the pentito Tommaso Buscetta, Geraci took care of the fugitive Riina while he stayed in Partinico.
Salvatore Greco, (May 12, 1924 in Ciaculli – ?)
 also known as "l'ingegnere" (the engineer) or "Totò il lungo" (Totò the tall) was a powerful member of the Sicilian Mafia.
 He was the son of Pietro Greco who was killed during a bloody internal feud between the factions of the Greco Mafia clan in Ciaculli and Croceverde Giardini in 1946.
 His cousin Salvatore Greco "Ciaschiteddu" was the first ‘secretary’ of the Sicilian Mafia Commission.
Calcedonio Di Pisa (October 11, 1931 in Palermo – December 26, 1962 in Palermo), also known as Doruccio, was a member of the Sicilian Mafia.
 He was the boss of the Mafia family in the Noce neighbourhood in Palermo and sat on the first Sicilian Mafia Commission, the coordinating body of Cosa Nostra in Sicily.
Antonio Salamone (December 12, 1918 in San Giuseppe Jato – May 31, 1998 in São Paulo) was a member of the Sicilian Mafia and a member of the first Sicilian Mafia Commission.
 His nickname was “il furbo” – the shrewd one.

Question: Nene Garaci sat on the Sicilian Mafia Commission with what member of the Sicilian Mafia who was suspected of having been the head of the Corleonesi?
Answer: Bernardo Provenzano