Rome, July 25 - The head prosecutor from the southern city of Salerno, Franco Roberti, was elected as Italy's national anti-mafia prosecutor on Thursday. Roberti, 61, who was elected unanimously by the Italian judiciary's self-governing body, the CSM, formerly headed Naples anti-mafia operations concentrating on the dangerous Casalesi clan, immortalized in Italian journalist Roberto Saviano's 2006 bestseller Gomorra that was later turned into a critically acclaimed film. Roberti has had "exceptional success in the fight against the Camorra...and his work as chief prosecutor in Salerno confirms his experience and unquestionable ability to guarantee the defense of our citizens and the shared values of legality and justice,''Giuseppe Esposito, the vice-president of parliament's COPASIR secret service commission, said. The newly elected anti-mafia chief will take office on August 10. Roberti replaces Senate Speaker Pietro Grasso, who stepped down as anti-mafia prosecutor in December to run in national elections.