3. The trial of all crimes, except in cases of impeachment, shall be by
jury; and such trial shall be held in the State where the said crimes
shall have been committed; but when not committed within any State, the
trial shall be at such place or places as the Congress may by law have
directed.
SECT. III. 1. 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.