The Via Domitiana is a busy dual carriageway cutting through the heart of the southern Italian seaside town of Castel Volturno. The less-observant tourist might miss it, but a look to the side of this road built during the Roman empire soon shows that this is no longer the fiefdom of ice cream-eating families and sunseekers. Dotted here and there are groups of Nigerian women and girls, clustered in twos and threes: they are trafficked prostitutes, selling sex for as little as €10 a time so that they might pay off enormous debts owed to their smugglers. Illegal immigrants first came to Castel Volturno from Nigeria in the 1980s to work on the tomato farms in the countryside but when those farms went out of business there was no work, legal or otherwise. Some of them soon realised there was a different kind of money to be made -- through the importing and selling of both drugs and humans in a district characterised by extreme poverty and high levels of violent crime. Since Castel Volturno sits in the heartland of the Camorra, a criminal network based in Naples, this could not be done without the consent of its local wing, the Casalesi clan. But as Nigerian gangsters extended their reach in a town that is now home to one of Europe's largest concentrations of illegal immigrants, the Casalesi reasserted its authority. In 2008 it killed six African men in a drive-by shooting -- the horror of the incident and the riots that followed is captured in Là-bas, a film set to premiere ...