have you lived in europe? where you live?
honestly pal, you have not any links that proof nigerians dominate some type of drugs in europe, except a swiss one lol
there are tons of articles that claim ndrangheta controls 80% of cocaine in europe, and that i think they hypes ndrangheta too much
thats' the same for that swiss article... nigerians are small players in europe, mules in mostly cases, they control nothing important
west africa is not only nigeria, it includes senegal, liberiam ghana and opther places and drugs pass through several ports
italian mafias have direct links with colombians, cells in latin america, cells in africa, they needn't nigerians transit ports in most of cases
in italy, again, the nigerian gangs are small, weak, they have not even guns, only italian oc have weapons in italy, you can't control streets withouth guns lol
not political connections, not tons of crime fields
some little prostitution racket at most, and they are forced to pay even for that

you're right there are nigerian criminal groups and terrorist groups linked with italian mafias, colombians and other groups
but were talking what nigerians really run in europe, almost nothing