I've heard that number before. Although they are very big into cocaine, especially the 'Ndrangheta, 80% seems very high, given the fact that there are other criminal syndicates in Europe too.

Here's an article (in English) about the 'Ndrangheta from the Spiegel, one of Germany's biggest newspapers. I think it was posted here before, but can't find it right now. If so, sorry for the rerun.

http://www.spiegel.de/international/europe/0,1518,806233,00.html