A site that I believe is a good resource on the Chicago Outfit is
http://www.ganglandchicago.blogspot.com The photos on there alone are worth a look. If you are interested in the Chicago LCN check it out.
Magnificant website!

It also has the 1983 chart I posted previously in another topic. According to this website it's a chart of the Chicago Crime Commission.
(right-click and click on see picture)
