While in hiding from both the authorities and the Corleonesi, Contorno sent anonymous letters to the police, revealing information on the Mafia, its members, the various factions and the violent turmoil it was undergoing. Police Superintendent
Antonino Ninni Cassarà developed a relationship with Contorno as an informant, code-naming him
Fonte di Prima Luce (Source of First Light). Contorno was arrested on 23 March 1982, in
Rome, where he had gone to prepare for the murder of
Giuseppe Pippo Calò who Contorno held responsible for the murder of his boss
Stefano Bontade. "Too bad I didn't succeed," he said during the
Maxi Trial. When he was captured, police found several weapons, two bulletproof cars, tens of thousands of dollars in cash, 140 kilograms of hashish and two kilos of heroin. The arrest probably saved his life, making Contorno one of the few survivors of the losing factions in the Second Mafia War. Contorno's revelations were the first time the authorities learned of
Michele Greco's high-ranking membership of the Mafia. Previously he had just been regarded as a rather secretive landowner with a suspiciously high income, although he did come from a long line of Mafiosi. Cassarà used Contorno to create a map of the families of the Palermo region and a report on their increasingly confrontational relations and involvement in narcotics (the so-called Greco+161 report on 13 July 1982). Working closely with Judge
Giovanni Falcone, two months later the police unleashed a dragnet roundup of 162 Mafiosi wanted for drug trafficking and homicide. ==Pentito and Maxi Trial==