Santino Di Matteo was a Mafia informant whose decision to collaborate with justice led to one of the most brutal acts of revenge in the history of Cosa Nostra.

Santino Di Matteo belonged to the Mafia family of Altofonte, a clan close to the Corleonesi, and was among the first men from that environment to break away from the world controlled by Totò Riina. Arrested on 4 June 1993, first imprisoned in Rebibbia and later transferred to Asinara, he was accused of ten Mafia murders and soon chose to collaborate with justice. His testimony became especially important because he was one of the men involved in the wider mechanism behind the Capaci massacre, even though he did not take part in the physical execution of the attack, and because he provided information on the killing of Ignazio Salvo. By deciding to speak, Di Matteo crossed a line that Cosa Nostra never forgave.

The response was savage. On 23 November 1993, his thirteen-year-old son Giuseppe Di Matteo was kidnapped by men linked to Leoluca Bagarella, Giovanni Brusca, Giuseppe Graviano, and Matteo Messina Denaro. The boy was taken as revenge for his father’s cooperation and used as a weapon of blackmail, a living message meant to force silence and loyalty through terror.

During the long months of captivity, Giuseppe Di Matteo was moved between different locations, hidden and guarded, completely cut off from the outside world. The objective was not only to punish, but to break the will of his father and to send a clear warning to anyone else who might consider collaborating with the State.

In October 1995, after more than a year of captivity, Santino Di Matteo himself disappeared for thirty-six hours from the protected location where he was being held and desperately tried to find his son on his own, but failed. It was a moment that revealed both the limits of protection and the desperation of a father caught between justice and personal loss.

On 11 January 1996, after 779 days of imprisonment, Giuseppe Di Matteo was strangled and dissolved in acid. The murder was carried out on orders linked to Giovanni Brusca, confirming once again the extreme brutality of the Corleonesi strategy. The use of acid, intended to erase every trace, became one of the most shocking symbols of Mafia violence.

That crime became one of the most horrifying episodes in modern Italian history. It showed that Cosa Nostra was willing to go beyond any limit, targeting not only enemies but innocent lives, in order to maintain control and enforce silence.

The role of Santino Di Matteo as a collaborator remained central despite the tragedy. His testimony helped investigators reconstruct important aspects of Mafia operations and contributed to the broader effort to dismantle the organization from within. His case also highlighted the risks faced by those who decide to break the code of silence, and the difficulty for the State in guaranteeing full protection.

Initially sentenced to twenty years in prison, Di Matteo was released in March 2002 and later returned to Altofonte. His story, however, cannot be separated from that of his son. The choice to speak came with a cost that went beyond any sentence, marking his life permanently.

Today, Santino Di Matteo is remembered not only as a Mafia informant, but as a figure linked to one of the most tragic and symbolic events in the history of organized crime. His story represents the extreme consequences of breaking the rules of Cosa Nostra, and the human cost of a system built on fear, silence, and absolute control.