Half a dozen men stand nonchalantly in front of a grubby building on one of Rome's busiest streets as cars whizz past. They stiffen whenever a stranger approaches.
But few would guess they're undercover cops protecting Italy's most endangered man.
Inside is Fr. Luigi Ciotti, a 69-year-old priest with soft brown eyes and silver hair who has spent the past 20 years fighting the Italian Mafia.