The Nigerian mafia has had a presence across Europe since the 1980s. In recent years, it has not only expanded but also pushed into the one Italian territory where no foreign mob had dared to go. Sicily was conquered and raided by Greeks, by Byzantines, by Normans. But for much of the past century, the island’s overlords have been Mafiosi, members of the Cosa Nostra group who specialized in racketeering, gambling and killing, and who have not typically shared their turf. “In the 1980s, 1990s, this never would have happened. Never,” Giuseppe Governale, the head of Italy’s central anti-mafia agency, said of Cosa Nostra sharing territory with outsiders.