
Treason is the only crime that is specifically defined in the US Constitution. The Constitution identifies what constitutes treason against the United States and limits the offence to two types of conduct: levying war against the US, and adhering to [its] enemies, giving them aid and comfort. The Treason Clause restricts Congress's power to change the definition of the crime and the evidence required to establish charges of treason.
| Characteristics | Values |
|---|---|
| Crime | Treason |
| Defined in | Article III, Section 3 of the U.S. Constitution |
| Consists of | "Levying war" against the United States or "adhering to their enemies, giving them aid and comfort" |
| Proof required | Testimony of two witnesses to the same overt act or a confession in open court |
| Prosecutions | Only one person has been indicted for treason since 1954 |
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What You'll Learn

Treason is the only crime defined in the US Constitution
Treason is the only crime that is specifically defined in the US Constitution. According to Article III, Section 3, treason is the act of waging or levying war against the United States or providing "aid and comfort" to its enemies. This definition is intentionally narrow, as the Framers of the Constitution wanted to restrict what could be considered treason, in response to the broad application of treason laws in English history.
The Constitution outlines specific requirements for proving treason, which include the testimony of two witnesses to the same overt act or a confession in open court. This was done to protect against abuse and ensure that treason charges could not be easily levied by a corrupt executive or Congress.
Despite the explicit definition and requirements for proof, treason prosecutions have been rare in American history. Since 1954, only one person has been indicted for treason, and Congress has only brought treason charges 30 times since the Constitution's ratification. The Supreme Court has played a role in further defining the types of treason and has heard several landmark cases involving the Treason Clause.
The inclusion of treason as the only defined crime in the Constitution is unusual, as typically this document either grants powers or denies powers to Congress, the president, or the judiciary. The specificity of the treason definition and procedural requirements highlights the seriousness of the crime and the need for careful consideration in its application.
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The Constitution defines treason as levying war against the US
Treason is the only crime that is specifically defined in the US Constitution. The Constitution identifies what constitutes treason against the United States and limits the offence to two types of conduct. The first of these is "levying war" against the United States, which is the act of waging war against the country.
Article III, Section 3, Clause 1 of the Constitution states that treason against the United States shall consist only of "levying war" against the country. The courts have the power to hear cases requiring them to determine whether an individual is guilty of "levying war" against the United States. This gives the courts a role in evaluating individual threats to national security.
The Supreme Court has clarified what it means to "levy war" against the United States. In Ex parte Bollman & Swarthout (1807), the Supreme Court interpreted the offence of "levying war" narrowly. The case involved an alleged plot by former Vice President Aaron Burr to overthrow the American government in New Orleans. The Supreme Court dismissed charges of treason against two of Burr's associates, Bollman and Swarthout, on the grounds that their conduct did not constitute "levying war".
The definition of treason in the Constitution restricts Congress's power to change the definition of the crime and the proof needed to establish charges. The treason clause protects against a corrupt executive or Congress from expanding the definition of treason. It also prevents them from changing the proof needed to secure a conviction.
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Treason can also be defined as adhering to enemies of the US
Treason is the only crime that is specifically defined in the US Constitution. Article III, Section 3 of the Constitution states that treason consists of one of two types of conduct: "levying war" against the United States, or "adhering to their enemies, giving them aid and comfort".
The act of adhering to the enemies of the United States and providing them with aid and comfort is, therefore, one of the ways in which treason can be committed under the Constitution. This part of the definition of treason was included to restrict the scope of treason, as the framers of the Constitution were aware of how treason had been abused in English history to target the king's enemies. The definition was intended to make it challenging to establish that someone had committed treason.
The Constitution's requirement of proof for a treason conviction is strict. It mandates that at least two witnesses testify to the overt act in question or that there is a confession in open court. This procedural safeguard is in place to protect against abuse of the treason charge.
Despite the narrow definition and strict requirements for proof, the treason clause has been invoked in several notable cases. For instance, in Ex parte Bollman & Swarthout (1807), the Supreme Court dismissed charges of treason against two associates of former Vice President Aaron Burr, who had allegedly plotted to overthrow the American government in New Orleans. The Court ruled that their conduct did not constitute "levying war" against the United States.
In more recent times, the federal courts have dealt with numerous cases involving accusations of individuals aiding enemies of the US, particularly after the September 11 attacks. These individuals have been charged not with treason, but with providing "material support" to terrorists or terrorist groups.
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The Treason Clause protects against an overreaching executive
Treason is the only crime specifically defined in the US Constitution. Article III, Section 3, Clause 1 of the Constitution states:
> "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 Supreme Court has interpreted the Treason Clause narrowly, dismissing charges against associates of Aaron Burr in 1807 because their conduct did not constitute "levying war." The Court ruled that there must be an actual assemblage of men for the purpose of executing a treasonable design to convict someone of treason. This set a precedent for future treason cases and made it difficult to convict someone of treason without their direct participation in hostilities.
While treason prosecutions are rare, the Treason Clause remains relevant as a reminder of the importance of protecting against national security cases and preventing overreach by the executive or Congress. The principles underlying the Clause extend beyond treason prosecutions, serving as a safeguard against abusive charges and protecting individual liberties.
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There have been few treason cases in US history
Treason is the only crime that is specifically defined in the US Constitution. Article III, Section 3 of the Constitution states that treason is the act of waging war against the United States or materially aiding its enemies. The Constitution also limits the offence of treason to two types of conduct: "levying war" against the United States or "adhering to [its] enemies, giving them aid and comfort".
Since the Constitution came into effect, there have been fewer than 40 federal prosecutions for treason, with even fewer convictions. According to the FBI, the US government has successfully convicted fewer than 12 Americans for treason in the nation's history. The first treason conviction sustained by the Supreme Court occurred in 1947. Since 1954, only one person has been indicted for treason.
The rarity of treason cases is partly due to the Framers of the Constitution intending to define treason narrowly, making it challenging to establish that someone committed treason. The Constitution restricts Congress's ability to change the definition of treason and the proof needed to establish charges. The Treason Clause also requires at least two witnesses to testify to the overt act in question, providing further protection against unfounded accusations.
While treason cases are rare, there have been notable instances in American history. One example is the indictment of Aaron Burr, who served as Thomas Jefferson's vice president, for treason in a plot to seize the Louisiana Territory. Another case involved Adam Yahiye Gadahn, an American who served as a spokesman for al-Qaeda and threatened attacks on American soil.
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Frequently asked questions
Treason is the only crime defined in the US Constitution.
Treason is defined as levying war against the United States or adhering to and providing aid or comfort to its enemies.
Treason must be proven by the statements of two witnesses to an overt act or a confession in open court.
Treason is seen as a unique crime, one that is most against the state. The definition was also influenced by English history, where treason was abused as a way of getting at the King's enemies. Thus, the specific definition of treason and the special requirements of proof were likely a way of narrowing the definition of what treason is.






















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