Furio,
IMO, based upon the activity, or lack thereof, over the last 10-15 years in both cities, Chicago and Detroit, I'd say that there really is no solid "Family" structure or formal network in either area as we've come to know it.
At best....at the very best, nowadays, these are the last remnants of "street guys" hanging by their eye-teeth, just trying to scrap by.
Theres some activity in Chicago, plenty of it. Also let me tell you there are plenty of action on the streets regarding gambling. Lots of people out there who much rather have a bookie than have a bigger cut of $$$ handed over to the state of Ilinois for their gambling addictions. Fuck the state of Illinois and their greed as they are far worse than any bookie on the streets today. Going through a bookie as a hardcore gambler dealing with straight cash is much better than going online with a credit/debit card or giving a cut to the state government.
You would have to be a fuckin moron to trust the State of Illinois.