Yes, "Hanoi Jane" is absolute scum.
Another scumbag from that era was a U.S. Navy petty officer named John Walker.
He worked at a headquarters in the Pacific that handled classified message traffic going back and forth from the Pentagon to MACV, all of which he had access to since he had a top secret clearance.
He decided at one point to start making a little money on the side to augment his Navy salary, so he started selling information to the Russians.
A lot of the information he was selling involved plans for upcoming military operations against the enemy in Vietnam.
The Russians simply passed all this info to the North Vietnamese, thus allowing them to get ready in advance for bombing raids.
He should have been executed by firing squad, but I believe he got life in prison at his courts martial.
ETA: Read more about scumbag here...
Scumbag