Most of the crucial evidence came from
Tommaso Buscetta. In February 1980, he was granted "half-freedom" from prison, immediately fleeing back to Brazil to escape the brewing
Second Mafia War instigated by
Salvatore Riina. On 11 September 1982, Buscetta's two sons from his first wife, Benedetto and Antonio, disappeared,
never to be found again, which prompted his collaboration with Italian authorities. This was followed by the deaths of his brother Vincenzo, son-in-law Giuseppe Genova, brother-in-law Pietro and four of his nephews, Domenico and Benedetto Buscetta, and Orazio and Antonio D'Amico. The war subsequently led to the deaths of many of Buscetta's allies, including
Stefano Bontade. Buscetta was arrested in
São Paulo, Brazil once again on 23 October 1983. He was extradited to Italy on 28 June 1984, where he attempted
suicide by ingestion of
barbiturates; when that failed, he decided that he was utterly disillusioned with the Mafia. Buscetta asked to talk to the anti-Mafia judge
Giovanni Falcone, and began his life as an informant, referred to as a
pentito. Buscetta revealed information to Falcone for 45 days, explaining the inner workings and hierarchical structures of
Cosa Nostra including the
Sicilian Mafia Commission, that, until then, were unclear because of the strict
code of silence. This became known as the "Buscetta theorem". However, Buscetta refused to speak with Falcone of the political ties of Cosa Nostra because, in his opinion, the State was not ready for statements of that magnitude, and proved to be quite general on that subject. Mobster
Salvatore Contorno was arrested in 1982. At first he refused to collaborate with
Ninni Cassarà and Falcone. After the decision of Buscetta to collaborate, Contorno changed his mind. According to some, Buscetta met Contorno who supposedly fell to his knees and kissed Buscetta's hand. Buscetta allegedly put his hand on his shoulder and said: “It’s all right, Totuccio, you can talk.” Contorno began collaborating in October 1984, and a week later 127 arrest warrants were issued against mafiosi. == Defendants and trial ==