I assume the "Bulgarian mafia" has some power in Bulgaria itself, but international activities are very limited. Most Bulgaria-connected criminal cases I come across here in Belgium involve Turks from Bulgaria instead of ethnic Bulgarians and it most concerns illegal contracting and prostitution; more often than not connected to established Turkish criminal organizations.
Romanian, Bulgarian and Hungarian gangs are pretty active in the Netherlands.
Over here in Belgium as well, but most of them seem to originate from the Roma gypsy population. They're mostly involved in organized scamming and theft. Prostitution happens as well, but they don't really have any formal control over this.
