[cmroanirgo]

Even more interesting is how the FBI knew they'd been infiltrated before they themselves did? (There's the obvious conspiracy style accusation in that they were already in there poking around... but that doesn't seem to ring true in this regard)

[auiya]

Same way any criminal investigator uncovers stolen goods.

[mtgx]

If the FBI wasn't then NSA definitely was and then told the FBI.