(Some) Past Americans Charged With Treason
an AP story last updated in 2015
Article III, Section 3:
Treason against the United States, shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort. 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.
The Congress shall have power to declare the punishment of treason, but no attainder of treason shall work corruption of blood, or forfeiture except during the life of the person attainted.
("Attainder of treason" referred to a practice in Europe at the time of impoverishing, ostracizing and banishing a traitor's family and descendants.)
moar at link and as attached
https://www.foxnews.com/story/past-americans-charged-with-treason