As this disturbing article in the English pages of Corriere della Sera illustrates, Satanism is quite a problem in certain parts of Italy. Accounts of Satanic rituals and murders like the ones described in the article are much more common in Italian newspapers than in the English-speaking world. The books of Fr Gabriele Amorth also testify to the fact that there's something decidedly evil at work in ceratin parts of Italy.
The article above mentions the North of Italy as being home to these cults - this agrees with what I have heard on an anecdotal level. I am also aware of certain places in the Castelli Romani with a bad reputation and note that in the churches of some Italian dioceses there are prominent notices warning of excommunication for those who steal the Blessed Sacrament and the Sacrament itself is reserved in a side-chapel protected by heavy-duty wrought-iron gates.