@REPYou are still kind of missing the point.
My point is not about whether she did or did not commit treason. I think she clearly did. My point is exclusively about the difficulty of meeting the constitutionally mandated level of proof.
Again, here is the relevant wording from the constitution
No person shall be convicted of treason unless on the testimony of two witnesses to the same overt act, or on confession in open court.
Now the tricky part is how does the two witnesses part apply in a treason by propaganda for the enemy case.
As I read that, the only overt act would be the making of the propaganda, and to be overt, the alleged traitor would have to be knowingly and willingly participating in the making of the propaganda, not just being duped into it.
So the making of the propaganda is what you need two witnesses for.
Would the US courts agree with my take, I have no idea.
IF they don't, and seeing/hearing the final propaganda is enough, returned POWs wouldn't be needed to meet the two witness requirement.
However look at how the US treated Fonda. They basically let her off the hook. Did they do so because public sentiment was so strongly against the war by the time it ended, or did they think they wouldn't be able to meet the required burden of proof (they thought the courts would agree with my take).
If the courts agree with me, you don't just need two POWs, because both witnesses have to testify to seeing the same overt act, you need two POWs that were both present at the same camp at the time that camp was visited by Fonda while the NVA was filming the visit.
Otherwise, you need two NV officials that were both involved in the making of the same piece of propaganda.
And again, if you can't obtain the required two witnesses, the only way to convict Fonda of treason is for her to confess in open court.
Because of the requirements in the constitution, they can't us any surviving recordings of the propaganda broadcasts as physical evidence as a replacement to human testimony.