A useful idiot. Somebody or something that is, unbeknownst to them or their allies, so strongly under adversarial influence that they can be controlled. Imagine

A useful idiot. Somebody or something that is, unbeknownst to them or their allies, so strongly under adversarial influence that they can be controlled. Imagine the potential chaos made possible by a double agent - without the natural suspicion that accompanies a self admitted traitor.