I know that Vito stop paying tribute to the Bonanno's and basically broke apart.

What I do wonder is, how did the Bonanno's get their drugs into the U.S. with tried and tested, long established, port of entry from Canada?

I assume, that Vito said, I ain't paying you another dime but you can still use Canada as an access point OR, Vito told Big Joey, now you will pay me!

Anyone know about this?