Officially the mob shouldn't be dealing in drugs anyway but as we know some of them are at it. As far as I see the different ethnic groups don't seem to step on each others toes. But if a mobster was in the drug business or gambling or loansharking or whatever and an Albanian or biker or whoever started taking their customers and hurting their profit line I would assume the expectation would be to deal with it first diplomatically but violently if necessary. Some mobsters would do that and I'm sure some would stay quiet and stomach the loss of cash which would be a bad look if anyone found out lol