The remarkable success of Prime Minister Mario Monti, feted as a hero both at home and abroad, has created turmoil among Italy's discredited politicians and is likely to provoke radical shifts in the political landscape over the coming year. Some analysts say the impact of Monti will spark a political revolution comparable to the "Clean Hands" corruption probe—whose 20th anniversary is this week. That scandal swept away the old order, sending hundreds of politicians to jail and forcing Bettino Craxi, the dominant figure of his era, into exile in Tunisia where he died. "The whole Italian system is in transition,...