FBI Stop Raping My Wife

Chicagoist has been seeing this man all over Flickr and has been getting emails asking us who he is. Our answer: "We dunno." Does anyone know what he's doing in the Loop with this sign? Chaseism, who took this photo and was kind enough to share it with Chicagoist, says the guy "just stands there emotionless. Hardly any movement, no verbal conversation, very odd." juggernautco reports that on the sign there is a specific FBI agent's name. Has anyone been up close enough to get the name? On this shot it looks like his name is Chris something. Oh, here: Chris Saviano? Help!