 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.