If you want, you can make him seem erratic and unreliable so they get rid of him. You can manufacture crises that might make one side or the other reveal the identities of other spies. In short, you own them. This is called the man-in-the-middle attack and if you think about it, it's pretty scary. Someone who man-in-the-middles your communications can trick you in any of a thousand ways. No man, I don't get scared. I'm always scared.