I've read it. As with the Mocro-Maffia, I think the books are interesting for a curiosity read, but at the same time they're pompous and sensationalist. They want to make it seem like the "Mocro-Maffia" is this huge organized crime syndicate while in reality they're a bunch of cocaine dealers (and definitely big time dealers, but most of the time they're just one or two steps above street-level trafficking) that can turn on each other at any given moment. There's a lot of disorganization, hence a lot of violence and most of them don't stay on top for a very long time. In districts where there's a big Moroccan population, the street-level sales is overwhelmingly Moroccan which lend a few of them the opportunity to become wholesalers to the street dealers as well - the same way it's happened with the Antilleans as well in the Netherlands.
In a way it definitely is organized crime, but at the same time they still got a lot to learn. There's a ton of non-Moroccan groups operating at the moment in Belgium and the Netherlands that still move tons, while the Moroccan gangs - probably due to the fact that their population is incredibly clustered and in turn the violence is as well - garner way too much attention. Any "taking over" statement is a crock: it's extremely rare to see a clash between a Moroccan group and a group from another background, mostly because when it comes to the higher echelons above the street-level the Moroccan groups in reality still tend to keep to their own district and directly challenging other established groups is way too much of a risky move.
In Borgerhout a lot of the drug feuds are at the same time local family feuds, sometimes even between related families.