Theres been cases in LA and colorado of street gangs and colombian cartels being involved with dispensaries in some form or another.

I think in the northeast you have a lot of dominican groups operating mills and packaging labs and then of course you have open air markets controlled by gangs and sets. There have been a few mob related oxy rings and other drugs arrests in the recent past, but nothing where you can say its an actual continuing business with them. Bartolmeo vernace was busted for heroin dealing but i don't know how big that operation was.