What corrupr job, which Jurgis willingly undertakes, teaches him how easy it is to dupe the workers?

Jurgis begins to be hired by different crooks and thieves to participate in different crimes for which he is paid. He participates in one scam in which he goes by several different names, picking up the weekly pay which did not belong to him and delivering it to a man named Buck Halloran. He is given the opportunity to rob rich businessmen, and the bartenders give him a way to escape. He gets tips on how certain horse races can be fixed, and so he bets on the horses and wins money. Even when Jurgis gets in trouble, he now has friends that can make a few phone calls and get him out of prison.