What happened to Dindić, for example?
CIA or Albanian KLA maybe? Some speculate
Arkan and prominent Red Star fans were hardcore mafia folk. You even admitted it yourself, Crow, it's a subculture and not broadly representative of Serbian culture at all.
but, you don`t know whole story
When Serbia was exposed to economic blockade and trade embargo (after 1991) by Israel, Islamic league, NATO and EU, only mafia was able to break the blockade around Serbia. So, mafia flourished. Official politics was in situation to tolerate mafia. It was the matter of survivor, no only of regime but also of ordinary people, children is hospitals. State had much bigger problems to deal with, starting from mujaheedines and NATO attacks in Bosnia, Hercegovina and Rashka region to the ustashe attacks on Krajina and Kosovo Muslim terrorists.
Only because of this situation was possible for people like Arkan to present itself as hero. He was warrior but notorious criminal in the same time, criminal capable to provide fuel and medications via black market (for example).
But, when embargo against Serbia was over, state started to deal with mafia problem. Since then, back in that time, Montenegro president Milo Djukanovic (internetional criminal boss) confronted with Milosevic and started his separatist policy.
Modern day Serbian state practically solved mafia problem and play leading role in the region, in that sense.