AP Photo

TERRACINA is a sprawling town south of Rome, popular as a destination for beachside weekends. Rivarolo Canavese nestles in the shadow of the Alps north of Turin. It has Roman ruins, a handsome 14th-century castle and fewer than 12,000 inhabitants. Neither of these very different places is in the traditional, southern heartland of Italy’s mafias. Yet both have recently been tainted—and dramatically so—by organised crime.