
Treason is the only crime that is specifically defined in the US Constitution. Article III of the Constitution defines treason as levying war against the United States or adhering to their enemies, giving them aid and comfort. The Framers of the Constitution intended to define treason narrowly, requiring a high standard of proof for conviction, such as the testimony of two witnesses to the same overt act or a confession in open court. This restriction limits Congress's ability to change the definition of treason and the proof required for conviction, protecting against the abuse of power by the executive or legislative branches. The rarity of treason cases and the specific definition in the Constitution highlight the unique nature of this crime in the US legal system.
| Characteristics | Values |
|---|---|
| Reason for defining treason in the Constitution | To restrict Congress's power to change the definition of the crime and the proof needed to establish charges of treason |
| Definition of treason | Levy war against the United States or provide aid or comfort to its enemies |
| Requirements for conviction | Testimony of two witnesses to the same overt act or confession in open court |
| Limitation | Treason by aiding the enemy cannot be committed during peacetime |
| Protection | The treason clause protects against a corrupt executive or Congress from expanding the definition of treason |
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What You'll Learn
- The framers of the US Constitution wanted to make it challenging to establish treason
- The Constitution limits Congress's ability to punish treason
- The Treason Clause gives courts the power to hear cases to determine guilt
- The Supreme Court has clarified what it means to levy war
- The definition of treason can only be changed through an amendment to the Constitution

The framers of the US Constitution wanted to make it challenging to establish treason
Article III of the US Constitution defines treason as "levying war" against the United States or "adhering to their enemies, giving them aid and comfort." This definition is specific and requires a high standard of proof for conviction, such as the testimony of two witnesses to the same overt act or a confession in open court.
The framers' intention was to prevent Congress from expanding the definition of treason and to protect against abuse of power. By including the definition in the Constitution, they limited Congress's ability to punish treason and ensured that any changes to the definition would require a constitutional amendment. This safeguard is particularly important given the seriousness of treason as a crime.
The Supreme Court has played a significant role in interpreting and clarifying the definition of treason. For example, in United States v. Burr (1807), Chief Justice Marshall clarified that merely conspiring to overthrow the government did not constitute "levying war." He emphasized that there must be an actual assemblage of people ready and intending to use force.
The Court has also addressed the issue of treasonous intent, holding that freedom of speech allows people to express anger toward the government but that words can indicate treasonous intent. Additionally, the Court has explored the history of the treason clause in-depth, such as in Cramer (1945), and provided guidance on the standard of proof required for conviction.
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The Constitution limits Congress's ability to punish treason
The Constitution of the United States defines treason as "levying war" against the country or "adhering to their enemies, giving them aid and comfort". This definition restricts Congress's ability to redefine treason or alter the requirements for proving treasonous acts. The Constitution requires the testimony of two witnesses to the same overt act or a confession in open court to prove treason.
The Framers of the Constitution intended to make it challenging to prove treason, informed by their experience with English law, which had a broader definition of treason that covered many actions against the Crown. The Supreme Court has clarified the meaning of "levying war" and "providing aid and comfort" to enemies, specifying that "levying war" involves the actual use of force or assemblage of people ready to use force, while "aiding the enemy" requires an action beyond mere sympathy.
The Constitution's definition of treason limits Congress's ability to punish treason by preventing them from expanding the definition or reducing the evidentiary burden. The Cramer Court recognised Congress's broad power to criminalise offences harmful to the nation but emphasised that this power has limits, specifically regarding the two-witness rule. Lower courts have generally avoided directly addressing whether Congress could circumvent the Treason Clause's protections by prosecuting similar but non-treason offences.
The Treason Clause gives courts the authority to evaluate individual threats to national security, and they have handled numerous cases involving accusations of aiding enemies through "material support" to terrorists or terrorist groups. However, prosecutors have increasingly relied on non-treason charges, such as the Espionage Act, to avoid the stringent requirements of the Treason Clause, particularly in national security cases.
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The Treason Clause gives courts the power to hear cases to determine guilt
The Treason Clause, or Article III, Section 3, Clause 1 of the U.S. Constitution, defines treason as levying war against the United States or providing aid and comfort to its enemies. This clause gives courts the power to hear cases and determine guilt, playing a crucial role in evaluating individual threats to national security. The Framers of the Constitution intended to narrowly define treason and make it challenging to establish, aiming to prevent a repeat of their experience with the broad English law of treason.
The Treason Clause sets a high standard for convicting someone of treason. It requires the testimony of two witnesses to the same overt act or a confession in open court. This safeguard ensures that treason convictions are based on substantial evidence and protects against false accusations. The clause also restricts Congress's ability to change the definition of treason or the proof needed for conviction, safeguarding against executive overreach.
The Supreme Court has clarified the meaning of "levying war" and "providing aid and comfort," ensuring a consistent interpretation of treason. In United States v. Burr (1807), Chief Justice Marshall distinguished between conspiracy and the act of levying war, stating that conspiracy alone is not treason. The Court has also addressed the admissibility of out-of-court confessions or admissions, further refining the legal understanding of treason.
Despite the Treason Clause's protections, prosecutors and judges have sometimes conflated treason with other charges, as seen in the Rosenberg case. The Rosenbergs argued that their convictions violated the Treason Clause due to a lack of constitutional safeguards, but their appeal was rejected. This case established that prosecutors could bring non-treason charges for conduct that could be considered treasonous, reducing the application of the Treason Clause's procedural protections.
In conclusion, the Treason Clause grants courts the authority to hear treason cases and determine guilt, ensuring a rigorous process for establishing treasonous acts. The clause's definition of treason, evidentiary requirements, and restrictions on Congress safeguard against misuse, while judicial interpretations have further refined the understanding and application of treason in U.S. law.
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The Supreme Court has clarified what it means to levy war
Treason is the only crime that has been defined in the US Constitution. Article III of the Constitution defines treason as "levying war" against the United States or "adhering to their enemies and giving them aid". The Supreme Court has clarified what it means to "levy war" and provide "aid and comfort" to enemies.
The Supreme Court has interpreted the Treason Clause throughout history, informing its modern understanding. Two cases from 1807 laid the foundation for what it means to levy war against the United States. These cases involved Aaron Burr, who, after losing a contentious presidential election and killing Alexander Hamilton in a duel, began an independent military campaign to seize lands in modern-day Louisiana and Texas, which at the time belonged to Spain.
In Ex parte Bollman, Chief Justice John Marshall clarified the difference between levying war and conspiring to levy war. Marshall stated that merely conspiring to "subvert by force the government of our country" was not treason. He distinguished between the offence of conspiring to levy war and the offence of actually levying war, stating that the former must be brought into open action by the assemblage of men for a treasonable purpose.
In United States v. Burr (1807), Chief Justice Marshall presided over the treason trial of Aaron Burr. During the trial, there was testimony that Burr was over 100 miles away from the location where the prosecution alleged Burr committed his overt act of treason. Relying on Ex parte Bollman, Marshall instructed the jury that it could only consider testimony regarding whether Burr had committed an act of war against the United States at that location. Marshall concluded that "no conspiracy for overturning the Government and no enlisting of men to effect it, would be an actual levying of war".
The Supreme Court has also explored the history of the Treason Clause in-depth in Cramer (1945). The Cramer Court recognized Congress's broad power to criminalize a wide range of offences harmful to the United States but underscored that even this power had its limits. The Court stated that Congress could not dispense with the two-witness rule by giving the offence another name.
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The definition of treason can only be changed through an amendment to the Constitution
Treason is a rare but very serious crime. The US Constitution defines treason as levying war against the United States or providing aid and comfort to its enemies. The Framers of the Constitution intended to define treason narrowly, making it challenging to establish that someone committed treason.
The Constitution's Treason Clause provides a specific definition of treason that can only be changed through an amendment to the Constitution. This restricts Congress's power to change the definition of the crime and the proof required to establish charges of treason. The clause also limits Congress's ability to punish treason. As such, it protects against a corrupt executive or Congress from expanding the definition of treason or changing the proof needed to secure a conviction.
The Treason Clause requires that treason can only be established through the testimony of two witnesses to the same overt act or on confession in open court. An overt act refers to an act that shows criminal intent and furthers the accomplishment of a crime. The intent to betray can be proved in the same way as the intent for any other crime. While sympathy for the enemy does not constitute aiding or comforting, the actor must take some action to provide aid or comfort. Additionally, treason by aiding the enemy can only occur during wartime and requires a formal declaration of war.
The Supreme Court has clarified what it means to "levy war" and provide "aid and comfort" to enemies. In United States v. Burr (1807), Chief Justice Marshall ruled that the Court could not try the defendant in the District of Columbia as the charged crimes did not occur there. Marshall also stated that the "enlisting of men to overturn the Government" would not constitute an "actual levying of war." Instead, there must be an actual assemblage of people who are ready and intend to use force.
In conclusion, the definition of treason in the US Constitution can only be changed through an amendment to the Constitution. This ensures that the definition remains narrow and specific, and it restricts Congress's power to alter the definition or the required proof for conviction. The Treason Clause also sets out specific requirements for establishing treason, such as the need for witness testimony or a confession, further safeguarding against unfounded accusations of treason.
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