I. The Enterprise
"At times material to this indictment there existed a criminal organization which is referred to hereafter as "the Chicago Outfit." The Chicago Outfit was known to its members and associates as "the Outfit" and was also known to the public as "organized crime," the "Chicago Syndicate" and the "Chicago Mob."  The Chicago Outfit was an "enterprise" as that term is used in Title 18, United States Code, Section 1961(4)."

Peter Fitzgerald takes down the entire leadership of the Chicago Mob from Marcello on down.

Great coverage at the Chicago Tribune.  (Reg. Req.)