Angelo La Barbera and his brother were the protagonists in a bloody conflict between rival clans in Palermo in the early 1960s. Known as the First Mafia War.In a prison in Perugia in 1975 three mafiosi stabbed him to death on October 28, 1975

Domenico Tripodo ndrangheta boss On August 26, 1976, was stabbed to death in prison on the request of the De Stefano’s with the help of Camorra boss Raffaele Cutolo, the boss of the Nuova Camorra Organizzata (NCO) who worked with the De Stefano’s in drug trafficking.

On 23 November 1980, during the earthquake in Poggioreale prison, the guards opened the cells and Pasquale Barra killed 3 inmates opponents of the NCO.

On August 17, 1981 Barra organized an ambush to kill Milanese crime boss and Cosa Nostra associate, Francis Turatello aka "Faccia D'Angelo" (Angel Face) in the courtyard of Bad'e Carros, the high security prison in Nuoro, Sardinia. Barra was assisted in the murder by two well known Sicilian assassins, Vincenzo Andraus and Antonino Faro. Turatello was unable to escape the ambush. Barra and Andraus held Turatello, while Faro stabbed him sixty times. In the ensuing confusion from the attack, Andraus was also wounded and would later receive minor surgery in the prison infirmary. After Turatello was dead, Faro disemboweled and chewed Turatello's intestines, then spat it out as a sign of contempt

August 31, 1982 Bergamelli (one of the leaders of the clan of Marseilles) was killed in a bloody manner by Paul Dongo in the prison of Ascoli Piceno

Jacques René Berenguer, detto Jacki (one of the leaders of the clan of Marseilles) was killed in the Nizza prison in the 1990.