I don't think Nigerians are going to war with Casalesi or vice versa.

Nigerian criminals are not dumb and - contrary to the bullshit media articles that always want to paint a new migrant group as a "major threat" - are not so quick to resort to violence. If anything, Camorra groups are generally speaking more violent than the Nigerians are.

Nigerians are the most numerous group in Castel Volturno though, which is a small town of about 20.000 inhabitants. Prositution and drug dealing is entirely under the control of Nigerian gangs. Whoever is the majority in an area, will be the one in power of local affairs. I don't really think Camorra cares all that much about Castel Volturno anymore.