Treason Is the One Crime the Constitution Defines, and It Defines It Narrowly

"Traitor" may be the most overworked word in American politics. It gets hurled at senators over a vote, at governors over a budget, at journalists over a headline, and at anyone who disagrees with anyone on a Tuesday. If every person called a traitor on social media were actually tried for treason, the federal courts would need to rent stadiums.

The Founders saw this coming, though they saw it in the form of English kings rather than cable panels. And so they did something remarkable. In a Constitution that leaves almost every crime to the ordinary process of legislation, they defined exactly one crime in the text itself, and they defined it narrowly on purpose. The treason clause is not a weapon. It is a shield, built by men who had been called traitors and knew what that word could do in the hands of power.

The text

Article III, Section 3 reads in full:

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.

Read it for its restrictions, because that is what it mostly contains.

1. "Shall consist only." The word "only" closes the category. Congress cannot add new kinds of treason by statute. There are two, and two only.
2. "Levying War." Not plotting, not wishing, not speaking. Levying war.
3. "Adhering to their Enemies, giving them Aid and Comfort." Adherence alone is not enough; there must be aid and comfort. And "enemies" means nations or forces in open hostility with the United States, not political opponents at home.
4. "Two Witnesses to the same overt Act." Not two witnesses to two different acts. Not one witness and a lot of circumstantial evidence. Two witnesses, same act, or a confession in open court.
5. "No Attainder of Treason shall work Corruption of Blood." The family of a traitor could not be punished. In England, a treason conviction could strip a family of its property and its right to inherit for generations. The Constitution forbids punishing the children for the parent.

Where the narrowness came from: England's treason law

To understand why the Founders were so careful, you have to know what they were reacting against.

The foundational English law was the Statute of Treasons of 1351, enacted under Edward III. It listed several forms of treason, including compassing or imagining the death of the king, levying war against the king in his realm, and adhering to the king's enemies, giving them aid and comfort. The Founders lifted the last two categories almost word for word. What they deliberately left out was the first one.

"Compassing or imagining" the king's death sounds absurd to modern ears, because it criminalizes a state of mind. Over the following centuries, English judges stretched it into what were called constructive treasons. Writing could be treason, on the theory that it imagined the king's harm. Words could be treason. Associating with the wrong people could be treason. Treason trials became the Crown's way of disposing of critics, rivals and religious dissenters, and the penalties were savage.

The American revolutionaries were acutely aware that by English law they were all traitors. The men who signed the Declaration of Independence signed their names to what the Crown regarded as a confession. When those men wrote a Constitution, they made sure their own government could not do to its critics what George III would have done to them.

Madison's explanation in Federalist 43

James Madison explained the clause in Federalist 43, and his words are the best summary of its purpose:

As treason may be committed against the United States, the authority of the United States ought to be enabled to punish it. But as new-fangled and artificial treasons have been the great engines by which violent factions, the natural offspring of free government, have usually wreaked their alternate malignity on each other, the convention have, with great judgment, opposed a barrier to this peculiar danger, by inserting a constitutional definition of the crime, fixing the proof necessary for conviction of it, and restraining the Congress, even in punishing it, from extending the consequences of guilt beyond the person of its author.

Look at the phrase "violent factions ... wreaked their alternate malignity on each other." Madison is describing a cycle: one party takes power and prosecutes the other for treason, then the other party takes power and returns the favor. "Alternate" is the key word. The treason clause is a ceasefire built into the Constitution. It says to every future majority: you may defeat your opponents at the ballot box, but you may not use this word to destroy them.

Madison's three protections are exactly the three the text contains: a fixed definition, a fixed standard of proof and a limit on punishment.

Ex parte Bollman: conspiracy is not treason

The clause got its first serious test in the strange affair of Aaron Burr.

After leaving the vice presidency in 1805, Burr traveled through the western territories gathering men, boats and supplies for an expedition whose purpose is still debated: a filibustering raid on Spanish territory, a land scheme, or a plan to detach western states from the Union. President Thomas Jefferson became convinced it was the last, and he publicly declared Burr's guilt before any trial.

Two of Burr's associates, Erick Bollman and Samuel Swartwout, were arrested and brought to Washington on charges of treason. In Ex parte Bollman (1807), the Supreme Court, through Chief Justice John Marshall, ordered them discharged. Marshall wrote:

To constitute that specific crime for which the prisoners now before the court have been committed, war must be actually levied against the United States. However flagitious may be the crime of conspiring to subvert by force the government of our country, such conspiracy is not treason. To conspire to levy war, and actually to levy war, are distinct offences.

That is the clause doing its job. A conspiracy, however wicked, is not levying war. There must be an actual assemblage of men for a treasonable purpose. The government could pursue conspiracy under other laws, but it could not call it treason. Bollman also matters for a second reason: the Court held it had power to issue writs of habeas corpus to examine the detention, a point we take up in Habeas Corpus Is the Oldest Liberty in the Constitution, and War Tests It.

The Burr trial: two witnesses to the same overt act

Burr himself was tried for treason in 1807 in the federal circuit court at Richmond, with Marshall presiding while riding circuit. The government's theory was that an assemblage of men on Blennerhassett Island, in the Ohio River in what was then Virginia, was the overt act of levying war, and that Burr was guilty as its organizer even though he was not present.

Marshall's rulings sank that theory. The Constitution required two witnesses to the same overt act. If the overt act was the assemblage on the island, the government had to prove by two witnesses that Burr participated in it, or prove his connection to it by the same constitutional standard. It could not substitute evidence of other acts in other places to fill the gap. The jury acquitted Burr on September 1, 1807.

Jefferson was furious, and there was talk in Congress of curbing the courts. But the verdict has stood for two centuries as a lesson: a president who has already announced a man's guilt does not get a conviction by announcement. The treason clause binds the executive as much as it binds Congress, and an independent judge is the one who enforces it. That is the separation of powers working as designed, the subject of Federalist 47 Defines Tyranny as All Powers Gathered Into the Same Hands.

Cramer v. United States: what the overt act must show

The clause's modern meaning was set during the Second World War. In 1942, eight German saboteurs landed by submarine on Long Island and in Florida. They were caught, tried by military commission, and most were executed. Anthony Cramer, a naturalized citizen who knew two of them, met with them in New York and agreed to hold money for one of them. He was convicted of treason.

In Cramer v. United States (1945), the Supreme Court reversed, five to four. Justice Robert Jackson wrote for the majority. The two witnesses had testified only that Cramer met and talked with the saboteurs in public places. Nobody testified to what was said. Jackson held that the overt act, proved by two witnesses, must itself show that the defendant gave aid and comfort to the enemy. A meeting over drinks, without more, did not. Jackson, who later served as chief prosecutor at Nuremberg, was no friend of the Nazi regime; his opinion was a defense of the Constitution's standard of proof, not of Cramer. We tell more of Jackson's story in Robert Jackson Left the Supreme Court to Prosecute the Nazis at Nuremberg.

Two years later, in Haupt v. United States (1947), the Court upheld the treason conviction of Hans Max Haupt, the father of one of the saboteurs, who had sheltered his son and helped him buy a car and seek a job at a factory making a bombsight. There, the witnesses proved acts that plainly gave aid. Between Cramer and Haupt lies the rule: the government must prove, by two witnesses, an act that itself aids the enemy.

How rare treason prosecutions are

Because the clause is narrow, federal treason prosecutions have been few. A short list shows the pattern.

• After the Whiskey Rebellion in Pennsylvania in 1794, two men were convicted of treason. President George Washington pardoned them.
• After Fries's Rebellion over a federal property tax in 1799, John Fries was twice convicted. President John Adams pardoned him.
• After the Second World War, several Americans who had broadcast propaganda for the Axis or mistreated American prisoners were tried, including Tomoya Kawakita, whose conviction the Court upheld in Kawakita v. United States (1952).
• In 2006, a federal grand jury indicted Adam Gadahn, an American who appeared in al-Qaeda propaganda videos, for treason. He was never tried.

Some famous cases were not treason at all. Julius and Ethel Rosenberg were convicted of conspiracy to commit espionage, not treason. The federal treason statute today, 18 U.S.C. 2381, provides for death or imprisonment of not less than five years, a fine, and permanent disqualification from federal office.

The strongest objection, and the answer

The objection. The 1787 definition was written for a world of muskets and redcoats. Modern threats come from terrorist networks that are not nations, from cyberattacks that levy no army, and from Americans who sell secrets to rivals with whom we are not formally at war. A definition limited to "levying War" and "Enemies" leaves the country unable to punish the gravest betrayals. The narrow clause is a relic.

The answer.

1. The clause limits the label, not the law. Congress has broad power to punish conduct that threatens the country under other names. Espionage, sabotage, seditious conspiracy, material support to designated terrorist organizations, and the unlawful disclosure of classified information are all federal crimes. None requires the treason clause.
2. The narrowness is the point. The Founders knew treason could be stretched; English history was a catalogue of stretching. Every proposal to broaden it would hand a future majority the "new-fangled and artificial treasons" Madison warned against. Those who want a broader definition should picture it in the hands of the party they trust least.
3. The standard of proof protects the innocent, not the guilty. Two witnesses to the same overt act is demanding. It is supposed to be. A charge that carries the possibility of death and the stigma of betrayal should not rest on inference.
4. The cases show the clause works. Bollman distinguished conspiracy from war. Cramer demanded proof of real aid. Haupt upheld a conviction where that proof existed. The clause has not stopped the government from convicting traitors; it has stopped the government from inventing them.

The verdict: the treason clause is not a relic. It is a constitutional guard against the oldest abuse in political history, and it deserves defending by every citizen who might someday be on the wrong side of a majority.

What this means for us

There is a lesson here for political speech as well as law. When public officials call their opponents traitors over policy disagreements, they borrow the vocabulary of the Statute of Treasons and drop the protections of Article III. Conservatives who care about the rule of law should hold the line on both sides: treason is levying war or giving aid to the enemy, proved by two witnesses, and nothing else. A vote you dislike is a vote. A speech you hate is a speech. The answer to both is the next election, as we argue in Lawfare Defined, and How to Tell a Prosecution From a Campaign Tactic.

The Founders also attached other protections to every serious criminal charge, including the right to a grand jury, to a jury trial, and against self-incrimination, which we cover in The Fifth Amendment Holds Five Rights, Not Just the One From the Movies and Speedy, Public, Impartial, Reading the Sixth Amendment's Promises One at a Time. Treason gets those protections plus its own. That is how seriously the Founders took the danger of the word.

The case in brief

1. Treason is the only crime the Constitution defines: levying war against the United States, or adhering to its enemies by giving them aid and comfort, and "only" those.
2. The Founders dropped England's "compassing or imagining" treason because kings had stretched it into a weapon against critics.
3. Conviction requires two witnesses to the same overt act or a confession in open court, and punishment may not reach the traitor's family.
4. Ex parte Bollman (1807), the Burr acquittal (1807) and Cramer v. United States (1945) enforced those limits against presidents and prosecutors alike.
5. Other statutes punish espionage, sabotage and terrorism; the narrow treason clause protects free people from the label, not traitors from the law.

What you can do: read Article III, Section 3 on our Constitution page, and the next time a public official calls an opponent a traitor over a vote, write to that official and ask which overt act of war or aid to an enemy they mean.