One of the two new enemies found in and only in Chicago: Stealth. They appear as Caucasian males with brown hair, dressed in a white shirt, a black tie, and a long brown trench coat.
Three of these men patrol the backstreets of Chicago, waiting for any sign of trouble. If they see you they will immediately call it in by talking into their wrist, giving you about four seconds to dispatch of them. If they are successful, an alarm will sound; causing even more men armed with DY357's to spawn. These agents will also pull out the aforementioned weaponry. Unlike the C.I.A. agents, however, you can actually take these pesky men out with a bullet.