The definition of “enemy of the state” does not exist in U.S. federal law. No statute uses the phrase, no court treats it as a category of offense, and no federal agency applies it as a legal label. It’s rhetoric, not law. What the U.S. legal system does define, sometimes with unusual precision, are the concepts people tend to mean when they reach for the phrase: treason, a narrow wartime definition of “enemy,” a cluster of related crimes like seditious conspiracy and insurrection, and administrative designations that can freeze a person’s assets and shut them out of the financial system without any criminal trial at all.
Treason: The Closest Constitutional Equivalent
Treason is the only crime the Constitution itself defines, and it defines it narrowly on purpose. Article III, Section 3 limits treason to two acts: waging war against the United States, or giving aid and comfort to its enemies.1Congress.gov. Article III, Section 3 – Treason The Framers wrote it this way because English treason law had let the crown execute political opponents by stretching the definition to cover speech, thought, and association. They wanted Congress locked out of that possibility.2Justia. U.S. Constitution Annotated – Article III
The federal criminal statute tracks the constitutional language. Under 18 U.S.C. § 2381, anyone who owes allegiance to the United States and either wages war against it or supports its enemies is guilty of treason.3Office of the Law Revision Counsel. 18 USC 2381 – Treason The allegiance requirement means the statute mainly reaches U.S. citizens and permanent residents, not foreign nationals acting for their own governments.
The Constitution also imposes an evidentiary burden found nowhere else in American criminal law. Conviction requires either two witnesses to the same overt act or a confession in open court. Prosecutors cannot substitute circumstantial evidence, surveillance records, or a single cooperator. Two people, one act. That rule is the single biggest reason treason charges almost never happen. The federal government has convicted fewer than a dozen Americans of treason in the country’s history, and no one has been charged with it since the aftermath of World War II.
The Wartime Definition of “Enemy”
The only place federal law actually defines “enemy” is the Trading with the Enemy Act. Under 50 U.S.C. § 4302, an enemy includes individuals or businesses residing in the territory of a nation the U.S. is at war with, the government of that nation and its officials, and any citizens of that nation the President identifies by proclamation as threats to national safety.4Office of the Law Revision Counsel. 50 USC 4302 – Definitions
This definition exists to regulate trade during declared war, not to label domestic dissidents or political opponents. Fitting the definition cuts a person off from U.S. markets and the U.S. financial system. Outside a declared war, the treason-sense concept of “enemy” becomes far harder to pin down, which is another reason treason prosecutions are so rare.
Related Federal Crimes
Because treason is so difficult to prove, federal law includes several offenses that address similar conduct with ordinary evidentiary rules. None of them uses the “enemy of the state” label, but together they cover the ground people usually associate with the phrase.
Seditious Conspiracy
Under 18 U.S.C. § 2384, two or more people who conspire to overthrow the government by force, wage war against it, forcibly oppose its authority, or forcibly seize government property face up to 20 years in federal prison.5Office of the Law Revision Counsel. 18 USC 2384 – Seditious Conspiracy No two-witness rule applies. Prosecutors used the statute against members of the Oath Keepers following the January 6th Capitol breach, producing the first successful seditious conspiracy convictions in decades.
Rebellion or Insurrection
A person who incites, assists, or takes part in a rebellion against U.S. authority faces up to 10 years in prison under 18 U.S.C. § 2383. A conviction also bars the person permanently from holding any federal office.6Office of the Law Revision Counsel. 18 USC 2383 – Rebellion or Insurrection
Advocating Government Overthrow
The Smith Act, 18 U.S.C. § 2385, criminalizes knowingly advocating or teaching the overthrow of the U.S. government by force, along with organizing groups dedicated to that goal and knowingly joining such groups. The maximum penalty is 20 years, and a conviction blocks federal employment for five years after release.7Office of the Law Revision Counsel. 18 USC 2385 – Advocating Overthrow of Government Courts have narrowed the statute considerably. A defendant must have advocated concrete action, not abstract ideology. The line runs between saying the government should be overthrown and saying how it will be done and when.
Misprision of Treason
Under 18 U.S.C. § 2382, anyone who owes allegiance to the United States, learns of an act of treason, and conceals it instead of reporting it to the President, a federal judge, or a state governor or judge faces up to seven years in prison.8Office of the Law Revision Counsel. 18 USC 2382 – Misprision of Treason The statute requires actual knowledge of a specific treasonous act combined with deliberate concealment. A rumor left unreported does not qualify.
A Note on Military Terminology
Military law uses its own vocabulary that sits outside the civilian criminal system. Under 10 U.S.C. § 948a, an “unprivileged enemy belligerent” is someone who has engaged in or materially supported hostilities against the United States or its coalition partners without qualifying as a lawful combatant.9Office of the Law Revision Counsel. 10 USC 948a – Definitions The term replaced the older “unlawful enemy combatant” after the Military Commissions Act of 2009. Lawful combatants receive prisoner-of-war protections; unprivileged enemy belligerents can be tried by military commissions rather than civilian courts. The designation has been applied mainly to foreign fighters captured abroad, not to U.S. citizens on domestic soil, though the legal boundaries have been intensely debated since 2001.
Executive Designations That Function Like an “Enemy” Label
The government does not need a criminal conviction to shut someone out economically. Administrative tools in the executive branch can produce consequences that rival a prison sentence in their practical impact.
The International Emergency Economic Powers Act
Under 50 U.S.C. § 1701, the President can declare a national emergency in response to any unusual and extraordinary foreign threat to national security, foreign policy, or the economy.10Office of the Law Revision Counsel. 50 USC 1701 – Unusual and Extraordinary Threat Once declared, the emergency unlocks broad authority to block financial transactions and freeze assets connected to the threat. Dozens of these emergencies are active at any given time, covering everything from foreign governments to terrorism financing networks.
The Specially Designated Nationals List
The Treasury Department’s Office of Foreign Assets Control maintains the Specially Designated Nationals list, which identifies individuals and organizations tied to sanctioned countries, terrorist groups, and narcotics operations. Being placed on the list freezes the person’s assets and prohibits U.S. persons from doing business with them.11Office of Foreign Assets Control. Specially Designated Nationals (SDNs) and the SDN List The economic effect can be devastating without any criminal charge. Banks close accounts, business partners cut contact, and ordinary transactions become impossible.
Foreign Terrorist Organizations
The Secretary of State can designate foreign organizations as terrorist groups under 8 U.S.C. § 1189 when the organization engages in terrorism threatening U.S. nationals or national security.12Office of the Law Revision Counsel. 8 USC 1189 – Designation of Foreign Terrorist Organizations After designation, providing the group with material support becomes a federal crime, and individuals connected to it can face prosecution or SDN listing.
Penalties, Citizenship, and Challenging a Designation
Treason carries the heaviest penalties in federal criminal law. Conviction under 18 U.S.C. § 2381 can result in the death penalty. If the court does not impose death, the minimum sentence is five years in prison, with a mandatory minimum $10,000 fine, and the convicted person is permanently barred from federal office.3Office of the Law Revision Counsel. 18 USC 2381 – Treason Seditious conspiracy and Smith Act violations each carry up to 20 years; rebellion or insurrection carries up to 10 years with a permanent federal-office ban; misprision of treason carries up to seven.
Loss of citizenship is a separate question. Under 8 U.S.C. § 1481, a person can lose U.S. nationality for treason, attempting to overthrow the government by force, seditious conspiracy, or Smith Act violations, but only after a court conviction and only if the government also proves the person acted voluntarily and with the intention of relinquishing U.S. nationality.13Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality That intent requirement makes involuntary denationalization extremely rare. A treason conviction alone does not strip citizenship.
An SDN designation is not a criminal conviction, and it can be challenged administratively. Under 31 C.F.R. § 501.807, a designated person can file a written petition with OFAC arguing that the factual basis was wrong or that circumstances have changed enough to justify removal, supported by corporate records, bank statements, affidavits, and evidence of compliance reforms.14eCFR. 31 CFR 501.807 – Procedures Governing Delisting There is no fixed timeline for a response, and complex cases involving classified intelligence can take a year or more. If OFAC denies the petition or delays unreasonably, the designated person can sue in federal district court under the Administrative Procedure Act. Courts review these decisions deferentially, but they have required OFAC to provide at least unclassified summaries of the evidence so a petitioner has a meaningful chance to respond.