I know that Chelsais Bouras was definitely a real guy who trafficked methamphetamine. He was connected to Ray Martorano. And Philadelphia has one of the largest Greek population in the country so it's definitely plausible that he had a crew of ethnic Greeks at his disposal.

Same thing with Astoria. It's always had a sizable Greek population. I always heard they were mostly involved in gambling and payed tribute to the Lucchese. However, they must have been small enough for the Rudaj Org. to muscle in on them.