synarchist wrote:"Agents of Oblivion" should work nicely for spy stuff - is that the setting you're referencing? Just replace the homebrew agencies with real ones and remove the supernatural elements. Mechanically, it should have all the extra "espionage" stuff you'd want - I do own it, but haven't read it in a while. And just to keep things on topic, you could probably pilfer a lot for a game focused on Coalition spies too.
Heh; I was actually planning on going in reverse--Legion spies sent to (or recruited in) Chi-Town.
Which means I'm already facing the task of coming up with a lot of material for a location that's mostly still a giant Mystery Box.