Defendant Marcello Dell'Utri (R) cleans his glasses as his lawyer Alessandro Sammarco (L) speaks during the trial at which Mafia informant Gaspare Spatuzza was to give testimony in Turin December 4, 2009. Italian Prime Minister Silvio Berlusconi goes back on trial for corruption on Friday, while in an unrelated Mafia case, a mobster-turned-witness may try to link him to the Cosa Nostra -- a connection he denies. Dell'Utri, a senator in Berlusconi's People of Freedom Party, is appealing against his conviction of association with the Mafia. He has been sentenced to nine years in prison. REUTERS/Alessandro Garofalo(ITALY POLITICS CRIME LAW)