They do know, they have oversight hearings regularly in a SCIF. As much as the CIA is romanticized, they can get in big trouble if they go rogue. They also have inspector generals for stuff like this and brief the president daily. The president can fire anyone in the CIA technically. Whil conspiracy theories sound cool and spooky let's stick to evidence unless you simply don't want blame for wars and chaos your voting causes. And that boys and girls is one more reason why I don't vote.