Police officers stand in front of a screen behind which Mafia informant Gaspare Spatuzza will sit as he gives his testimony, inside a courtroom in Turin December 4, 2009. Italian Prime Minister Silvio Berlusconi goes back on trial for corruption on Friday, while in an unrelated Mafia case, mobster-turned-witness Spatuzza may try to link him to the Cosa Nostra. REUTERS/Alessandro Garofalo(ITALY CRIME LAW POLITICS)