A couple of stories regarding Chicago guys in prison.

In the Family Secrets trial it came out that Frank Calabrese Snr had a set-to in prison with Shorty LaMantia about the proper way you can and can't introduce yourself to other mobsters.

http://blogs.suntimes.com/mob/2007/07/the_humiliation_of_shorty.html

Also, in an interview a few years before he died Harry Aleman gave an interview in which he touched on life in a state prison for an older guy -

http://www.thechicagosyndicate.com/2005/10/profile-harry-aleman.html

Quote:
Aleman once sent ripples of terror throughout the underworld, and segments of legitimate society, but his own fears appear much different. They don't seem to involve the joint because he says he has no real trouble, from guards or other inmates. People treat the older guys with some deference, he says, and he and the other old-timers are known as "pops" by the younger, mostly black prison population.