Since 9/11 the feds have largely concentrated their resources on terrorism. Factor in every other problem they have (drug trafficking etc.) and I doubt there is anywhere near the resources being directed toward the mob as there used to be.

Particularly in a place like Chicago where by all visible evidence the crime is nonviolent and basically amounts to a fairly small scale network of illegal gambling.

Look at the drug/streetgang problem here in Chicago. Hundreds of people are killed every single year in their turf battles. How much time can they devote to the mob, that hasn't killed a single person in years?

The danger of the mob of course is its capacity for corruption.

I'm sure law enforcement still have a fair amount of agents dedicated to the Outfit, but I doubt its that high on their priority list these days.