From TV to Hollywood, the world has no shortage of mafia dramas, but Marco Bellocchio’s The Traitor (Il traditore) carves out its own niche. Its behind-the-scenes view of Sicily’s real-life men of honor who were brought to justice in the 1980s and 1990s aims to be realistic rather than eye-popping and for that reason, can sometimes feel just a bit flat and unentertaining. But despite its lack of mafia money scenes — there’s no horse’s head in the bed, no family gunned down on the steps of a church — this is one of the most ...