the nigerian mafia's stronghold in europe is the small town of castel volturno, just outside naples. >> this is nigeria. >> ts is thetalilian coastal community ofasastel vournono, near naples. once a an upscale reresort, now it's a wasteland. we visited before the coronavirus pandemic. >> this is nigereria. >> the nigerian mafia has taken root here. this former member tells us how his countrymen make millions in people smuggling, drug running and prostitution. he wishes to remain anonymous. so we will simply call him davide. he changed sides to work with the italian authorities and now his life is in danger. >> castel volturno is a big headquarters for the nigerian mafias because this is the only place they can stay without control and there are many hidden places here in castel volturno where they can hide their things and they can do everything they want without notifying the state or the police. >> davide used to work as a drug courier for the nigerian mafia. he would swallow sealed pellets containing cocaine and then smuggle them across international borders to italy. >> so i can