Ex-Cosa Nostra boss threatens to slaughter prosecutors 'like tuna' He said anti-mafia prosecutors were driving him "crazy." "Those guys have to die, if it's the last thing I do," he reportedly said. He also made a reference to the murder of one of Italy's most respected anti-mafia investigators, Giovanni Falcone, who was blown up by a car bomb in 1992. "He wanted to go and see the tuna slaughter, instead I brought the slaughter to him," he said from inside his cell in a high security prison in Milan. The authorities are now reviewing security arrangements for Mr Di Matteo and other prosecutors. "We're deeply alarmed," Francesco Messineo, a prosecutor in Palermo, told La Repubblica. The threats seem to be a call to arms by Riina to his supporters against magistrates. Messages of support were sent to the prosecutors by senior Sicilian politicians. Riina was arrested in Palermo in 1993 and sentenced to life in prison after being convicted of multiple murder charges. Nicknamed in Sicilian dialect U Curtu or Shortie, Riina is believed to have personally killed around 40 people and to have ordered the assassination of many more. He was born and raised in Corleone, the hilltop Sicilian town which was immortalised in The Godfather books by Mario Puzo and the subsequent films starring Marlon Brando and Al Pacino. Cosa Nostra has seen its power diminish in recent years following a string of successful police operations, including raids and mass arrests of suspected mafiosi. As its influence has waned, it has been eclipsed by Italy's two other main crime syndicates - the Camorra of Campania and the 'Ndrangheta of Calabria.