There's information on them in Corporate Enclaves and Corporate Guide. I included a brief blurb about how they operate in one specific instance in Spy Games. I think they also appear in the new module, A Fistful of Credsticks since it's about Horizon. However, I'd have to check. Generally speaking there isn't much about them, but I think it's safe to say that a book called Conspiracy Theories may mention them.
They are social adept commandos (So... Spies. Really good spies.). That should give anyone pause just on principle.