 In Sicily, the phenomenon of pentito (Italian "he who has repented") broke omertà.Among the most famous Mafia "pentiti" is Tommaso Buscetta, the first important witness in Italy, who both helped prosecutor Giovanni Falcone to understand the inner workings of Cosa Nostra and described the Sicilian Mafia Commission or "Cupola", the leadership of the Sicilian Mafia.A predecessor, Leonardo Vitale, who gave himself up to the police in 1973, was judged mentally ill and so his testimony led to the conviction of only himself and his uncle.