Cosa nostra
Mutolo also testified in the United States, at the so-called Iron Tower II trial in the Southern District of New York City against Giovanni Gambino and Giuseppe Gambino and four high-ranking members of the Sicilian Mafia. Together with another cooperating witness and mafioso turned pentito, Francesco Marino Mannoia, Mutolo provided landmark testimony documenting the ongoing nexus between the Sicilian Mafia and the American Cosa Nostra. (Sicilian Mafia member, Rosario Naimo, who acted as a representative to the American Cosa Nostra for the Sicilian Mafia, remained a fugitive, until his capture in Palermo, Sicily on October 2, 2010.)