Pietro Aglieri (Italian pronunciation: [ˈpjɛːtro aʎˈʎɛːri]; born 9 June 1959) is a Sicilian mafioso from the Guadagna neighbourhood of Palermo.

He was also on trial for the 1992 murder of Salvo Lima, a Sicilian politician with close links to Giulio Andreotti, the former premier accused of Mafia association.

[4] On 6 June 1997 Aglieri was arrested in a disused lemon warehouse in the dilapidated industrial area of Bagheria together with his lieutenants, Natale Gambino and Giuseppe La Mattina.

His proposal was that mafiosi would get more lenient penalties (in particular the relaxation of the 41-bis prison regime) in return for recognizing the existence of Cosa Nostra and the authority of the Italian state.

[5] Aglieri had been approached by Vigna in February 2000 in an attempt to get mafiosi to "dissociate" from Cosa Nostra — without becoming collaborators of justice — a method that was used successfully in the struggle against the Red Brigades.

Aglieri's letter in March 2002 was followed by the statements of Leoluca Bagarella during a court appearance in July 2002 in which he suggested that unnamed politicians had failed to maintain agreements with the Mafia over prison conditions.

Most investigative magistrates opposed the proposal realising it would leave Cosa Nostra intact and would restore the hidden relationship between the Mafia’s shadow state and Mafia-friendly authorities.

Nevertheless, Aglieri started to study church history with La Sapienza University in Rome while in Rebibbia prison and graduated in theology.

[14] Judge Alfonso Sabella, remembered that when he arrested Aglieri and hoped he would start to collaborate with the authorities, the Mafia boss gave him a lecture on the power of the Mafia: “Look, Inspector, when you come into our schools to speak of legality, justice, respect for the law, of civil co-existence, our youth will listen to you and follow you, but when these youngsters come of age and look for work, a house, economic and health assistance, where do they find them?