It's not entirely unlikely. These days more than a few mobsters definitely have relatively close connections to for instance street gang members and bikers, as well as other ethnic mobs. If they wanted they could very easily find some Albanian or Russian hitman or some African American, Dominican or Puerto Rican gangbanger who'd do a hit for a quick buck. The thing is, wiseguys do not yet have enough trust in the competence of non-wiseguys to pull off a hit like that. Logically, when you see that Sally Daz' son outsourced the hit on his father to a few Bloods members and look at the mess they made of that one.