For the small clans that dont had the money of the organization (due the arrest or the murder of the members) for traffick in drugs there many ways also profitables for make money:
The counterfeiting of cds and dvds, smuggling cigarettes, fraud of the funds of the European Union for Agriculture, fake street accidents but also with saling the finds archeological in the black market,steal cars and ask money to the owners for turn the car (aka il cavallo di ritorno) and extort the black pimps or the small pushers and the most evil aka bury dangerous waste ( I read of a ten year old died of cancer).
The Angelina Jolie chapter refer to the Casalesi clan that was the biggest clan in Campania.