I never got why Greek OC was so underexposed. I live in Belgium in a former coal mining district - with fairly large populations of Italians, Turks, Moroccans and a smaller but substantial Greek population as well - and basically every Greek enclave I've ever been to has at least some shaky stuff going on. The criminal element over there doesn't make a lot of noise, but it's there. Drugs, protection, gambling...it's definitely there.
I always imagined, if it's like that in bumfuck Belgium, there must be stuff like that going on in other countries as well.