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Constitutional text
Article III · Section 3 4 selectable clauses · PDF
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8
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
Source: the uploaded National Constitution Center edition. Historical wording and its bracket
markers remain visible; later amendments and the reading notes explain changes.