This sums up the Chicago Outfit better than the movie Casino.
There's a Soprano's episode in which Tony is being advised by his attorney, Neil Mink, to which Mink advises, "...the FBI put an investment into it's operation and soon enough they'll want a return on that investment."
I'm also willing to bet that Chicago has NO interaction with New York. Chicago will go defunct before the DeCavalcante's I think also.
"The Feds are a business Anthony, millions of tax dollars are invested in watching your ass, sooner or later, just like you, their gonna want a return on their investment." --- Neil Mink, Tony Soprano's lawyer