Streetgangs.com is also a good site on the Mob and the other gangs
http://www.streetgangs.com/billboard/index.php?sid=5364969fc56e363dea08e5910bc3ba0e

http://mafiacrimes.forumfree.it/ is a good site on the Italian OC (in italian)

http://faidadiscampia.blogspot.it/ a site on the camorra (in italian)