What is the meaning or significance of 'suit from Chicago'
When Sheriff Millard (played by Andre Braugher) told the ATF Agent Reese (played by Paul Wesley), "I don't have to do what a suit from Philadelphia tells me," the ATF Agent replies, "No, but you have to do what a suit from Chicago tells you."
What is the meaning or cultural significance of "suit from Chicago" ? Does it mean that Agent Reese is from Chicago, or his head office / director is in Chicago, or does it have any implication of the mob?