They have to work with others mainly because LCN is no longer the absolute top dog. IF they were the top dog, they could get away with dictating to other groups and basically using other groups to do their dirty work.
cos nostra is involved in tons of fields with virtually no competitors, the only field where there are competitors is the drug traffick i think the mafia let this field a bit down coz in the states the sentences for this crime are too high not because of other competitors, people could get even 40 years there for drug it's not so worth, its not like italy where you take 7 years at most
