Constitution
Article III, Section 3: Treason
Section 3 defines treason narrowly as levying war or giving aid and comfort to enemies, and requires two witnesses or a confession in open court.
The text
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.
In plain English
Clause 1: the definition. Treason "shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort." There are two kinds: making war on the United States, and siding with its enemies. The word "only" shuts the door on expansion by statute.
The proof. Conviction requires "the Testimony of two Witnesses to the same overt Act, or Confession in open Court." One witness is never enough, however credible.
Clause 2: punishment. Congress sets the penalty, but "Corruption of Blood" is forbidden: a traitor's heirs may not be punished or lose their inheritance for his crime, and forfeiture of the traitor's property may last no longer than his life.
Treason is the only crime the Constitution defines, and it defines it narrowly on purpose.
What the Founders said
English law had made "compassing the death of the king" and loosely defined "constructive treason" into a weapon against political enemies. The Statute of Treasons of 1351 set a narrower list, and Tudor and Stuart governments had stretched it. The Framers put the definition into the Constitution so that Congress could not enlarge it.
Madison explained the purpose in Federalist No. 43: the new constitution, by fixing the definition, guarded against "new-fangled and artificial treasons" that had been "the great engines by which violent factions, the natural offspring of free government, have usually wreaked their alternate malignity on each other."
The two-witness rule was taken from English law and gave defendants a protection against false accusation.
How the courts have read it
- Ex parte Bollman (1807): "levying war" requires an actual assemblage of men for a treasonable purpose, not mere conspiracy; Chief Justice Marshall's opinion in the Burr-related case set a narrow construction.
- United States v. Burr (1807): Aaron Burr was acquitted at trial; Marshall required proof of an overt act by two witnesses and held that planning is not itself levying war.
- Cramer v. United States (1945): the overt act must itself show treasonable intent, and two witnesses must prove it.
- Haupt v. United States (1947): the Court upheld a treason conviction of a father who sheltered and helped his son, a German saboteur, applying Cramer.
- Kawakita v. United States (1952): a dual citizen could be convicted of treason for abusing American prisoners of war while living abroad.
Why it matters now
Treason is the crime most often misused as a political epithet. Words such as "treason" and "traitor" are thrown around in every election cycle for conduct that is merely disagreeable or even unlawful. The Constitution says otherwise. Corruption, leaking, negligent security and unpopular views are not treason; levying war and giving aid to enemies are.
The narrowness is a deliberate protection of dissent. A government that could label opposition as treason could eliminate it. That is why the text uses the word "only," and why the courts have required clear proof.
The constitutional definition does not leave the nation defenseless. Espionage, sedition, material support for terrorism and other offenses can be defined by Congress without calling them treason. The distinction preserves both national security and political freedom.