In the Balkans - like everywhere OC - exists. And OC has very strong links to the security/intelligence services.

In Albania, OC is widespread and Albanian groups operate in many countries.

I'd say the weakest OC in the Balkans is in Romania, and that has a lot to do with their police. The police there do NOT mess around. I've seen it first hand.

Bulgarian OC has weakened somewhat since they joined the EU.

Serbia and Montenegro has strong OC, with very tight links to the security services.

In Greece, there is local OC, but the speciality of Greek OC is large scale smuggling. They smuggle fuel, cigarettes, weapons, and on a smaller scale drugs into Greece, but international drug trafficking/smuggling is their specialty. And it is much larger than ppl know. There have been some very large drug busts involving Greeks (one guy was caught in Italy, charged with trafficking 10 tonnes of cocaine. A few years ago the police hauled in a 2 tonne heroin shipment here. Another guy, 1 tonne. etc etc).

But I would agree that Serbian and Albanian OC is the "strongest" in the Balkans.