McCormick Place is called the nation's largest convention center, but reputed Outfit guys, ex-cons and criminals have another name for it: A haven. The kind of guys who populate a prison yard have been getting work at McCormick Place for decades, especially through the small but politically powerful riggers union that sets up some of Chicago's biggest trade shows, including the Chicago Auto Show. There's a man working there who has ties to reputed organized crime figures and who helped run a heroin ring while locked up in Leavenworth. There's also a mobster's son, a convicted felon, who beat a...