Cartel is also a collective noun... it would be just like having Gang, Mafia, or Organization as a last name.
Forelli does not seem very original, just from my perspective... not to mention it is historically a GTA crime family which operates in the Liberty and Vice Cities.
Morelli and Moretti sound like generic italian names... I'd go for something that makes a better impact.
Ferrari looks laughable as a last name... let me introduce you to the Ducati and Lamborghini mafias. :roll:
King sounds quite common, but would be okay if it is not in use already.
Italian is becoming somewhat overused in crime family themes, why not go for something more English?
Morris
Biddle
Clayton
Wharton