Recently there have been some busts in Liege because of two feuding Sicilian mafia clans from Agrigento. Liege and Hainut both have a pretty big Sicilian mafia activity: the Limburg province has less of a Sicilian mafia presence but a much bigger Ndrangheta presence.

Homegrown organized crime is coincidentally also mainly in the provinces of Limburg and Liege;

In Limburg most of it is based around families born in the former mining communities. I'd say those families tend to be of Italian descent, but they were born in Belgium and they are not directly inducted in a bigger Italian organization. As with the A. family the gang was/is based around a family with Italian heritage, but the third person in the organization is a Belgian guy and plenty of other members of the organization are local Belgians as well. It's not Ndrangheta, but they're definitely involved in large scale international drug trafficking.

In Liege the "Liege mafia" is pretty infamous. They're distinct from the Sicilian mafia that's also active in Liege, but the two definitely cooperate. The "Liege mafia" is - like most criminal organizations called "mafia" these days - not really a mafia, but it's more like a confederation of local career criminals from towns in rural Liege. Nevertheless, they're very serious guys. They're mostly famed for often brutal hold-ups of cash transports as well as other organized robberies where they often made use of specialized weaponry like the FN P90. Aside from this they're also involved in other stuff like car scams and frauds (many of them also have an "official" job as local used car dealers), extortion, money laundering (they own quite a bit of property throughout Liege) and some gambling and drugs (though the drug trafficking doesn't seem to be on a large international scale). In 2004 there was an infamous "underworld clean-up" and about 10 local gangsters from the Liege area were liquidated.