The phrase “enemy of the state” has no formal meaning in United States federal law, but it functions as shorthand for a real legal category: a person whose conduct the government treats as a direct threat to national survival. Statutes replace the phrase with precise terms like “unprivileged enemy belligerent” and prosecute the underlying behavior through charges such as treason, espionage, seditious conspiracy, and material support for terrorism. The consequences of being placed in that category can include decades in prison, frozen assets, and the loss of U.S. citizenship.
The Terms Federal Law Actually Uses
No federal statute contains the words “enemy of the state.” Courts and military tribunals rely on defined terms that trigger specific consequences. The most consequential is unprivileged enemy belligerent, defined in federal military law as a person who has engaged in hostilities against the United States or its coalition partners, has purposefully and materially supported those hostilities, or was part of al Qaeda at the time of the alleged offense.1Office of the Law Revision Counsel. 10 USC 948a – Definitions The classification covers people who participate in armed conflict without belonging to a recognized nation’s regular military, and it determines whether someone can be tried by a military commission rather than a civilian court.
A much older statute, the Alien Enemies Act of 1798, gives the President authority to detain or remove noncitizens of a hostile nation during a declared war, or when a foreign government perpetrates, attempts, or threatens an invasion of U.S. territory. It reaches all noncitizens of the hostile nation who are fourteen or older and present in the country.2Office of the Law Revision Counsel. 50 USC 21 – Restraint, Regulation, and Removal The Act was invoked by presidential proclamation in March 2025. In Trump v. J.G.G., the Supreme Court held that noncitizens detained under it are entitled to Fifth Amendment due process, including notice of the legal basis for detention and a meaningful opportunity to challenge it through habeas corpus.3Supreme Court of the United States. Trump v. J.G.G.
The Criminal Charges Behind the Label
Most of what people mean by “enemy of the state” corresponds to one of a handful of federal offenses. Each carries severe penalties, and several carry consequences beyond prison time.
Treason
Treason is the most serious charge the federal government can bring against a citizen, and the Constitution limits it to two acts: waging war against the United States, or giving aid and comfort to its enemies.4Constitution Annotated. Article III Section 3 The evidentiary bar is deliberately high. No one can be convicted without the testimony of two witnesses to the same overt act, or a confession in open court. Conviction carries death or a minimum of five years in prison and a fine of at least $10,000, plus a permanent ban on holding any federal office.5Office of the Law Revision Counsel. 18 USC 2381 – Treason
Espionage
Federal espionage laws target anyone who gathers, transmits, or loses national defense information. The more common charge covers mishandling classified material relating to national defense, whether through intentional disclosure or gross negligence, and carries up to ten years in prison.6Office of the Law Revision Counsel. 18 US Code 793 – Gathering, Transmitting or Losing Defense Information The far more serious version applies when someone delivers that information to a foreign government with intent to harm the United States or benefit the foreign power, and is punishable by death or any term of years up to life.7Office of the Law Revision Counsel. 18 US Code 794 – Gathering or Delivering Defense Information to Aid Foreign Government The gap between the two often turns on who received the information and why.
Seditious Conspiracy
When two or more people agree to overthrow the government by force, wage war against the United States, or use force to prevent federal law from being carried out, they face charges of seditious conspiracy. The plan doesn’t have to succeed. The agreement plus any act in furtherance of it is enough, and conviction carries up to twenty years.8Office of the Law Revision Counsel. 18 USC 2384 – Seditious Conspiracy Most claims about being treated as an “enemy of the state” land here in practice, because the statute is built for groups that plot against the government but don’t meet the narrow constitutional definition of treason.
Rebellion or Insurrection
Anyone who incites, assists, or engages in rebellion or insurrection against federal authority faces up to ten years and a permanent bar from federal office.9Office of the Law Revision Counsel. 18 USC 2383 – Rebellion or Insurrection Unlike seditious conspiracy, the charge can apply to a single person acting alone.
Material Support for Terrorism
Providing money, training, personnel, weapons, or other tangible resources to a designated foreign terrorist organization is a federal crime even if the provider never takes part in violence. Conviction carries up to twenty years, and life if anyone dies as a result of the support.10Office of the Law Revision Counsel. 18 USC 2339B – Providing Material Support or Resources to Designated Foreign Terrorist Organizations Prosecutors reach for this statute most often in terrorism cases because it does not require proof that the defendant planned or carried out an attack.
Who Applies the Label
The authority to treat someone as a national threat is spread across the federal government under different legal frameworks.
The President holds the broadest power. The 2001 Authorization for Use of Military Force allows the executive to use all necessary force against anyone determined to have planned, authorized, committed, or aided the September 11 attacks, or harbored those who did.11Congress.gov. Public Law 107-40 – Authorization for Use of Military Force It has been read to cover ongoing operations against affiliated groups beyond the original attackers, and the determination typically rests on intelligence about a person’s ties to hostile organizations.
The Secretary of State designates Foreign Terrorist Organizations through a formal process. An organization qualifies when it is foreign, engages in terrorist activity or retains the capability and intent to do so, and its activity threatens U.S. nationals or national security.12Office of the Law Revision Counsel. 8 USC 1189 – Designation of Foreign Terrorist Organizations Once an organization is designated, anyone who supports it commits a federal crime, which is how the designation reaches individuals.
The Treasury Department’s Office of Foreign Assets Control administers economic sanctions against designated terrorists, narcotics traffickers, weapons proliferators, and other threats to national security.13Office of Foreign Assets Control. OFAC Home Under Executive Order 13224, any transaction by a U.S. person involving the property of a designated global terrorist is prohibited, and certain humanitarian exemptions that ordinarily apply under sanctions law do not extend to these designations.14Office of Foreign Assets Control. Counter Terrorism Sanctions
What Happens After the Label Attaches
Financial Isolation
When OFAC places an individual on the Specially Designated Nationals list, the effect is immediate. Every U.S. bank, business, and citizen is prohibited from transacting with that person. Assets held in U.S. financial institutions are frozen, credit cards stop working, and financial institutions that discover a connection to a listed individual must freeze the accounts and report them. Because the U.S. dollar underpins so much of global commerce, foreign banks with U.S. correspondent accounts routinely cut ties with designated individuals to avoid their own exposure. An SDN listing can make participation in the formal financial system nearly impossible worldwide, and it happens without any criminal conviction.
Loss of Citizenship
Federal law allows the government to strip a person of U.S. nationality for certain acts against the state. Anyone convicted of treason, attempting to overthrow the government by force, bearing arms against the United States, or engaging in a conspiracy to overthrow the government loses their nationality upon conviction by a court or court martial.15Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality A person who enters or serves in the armed forces of a foreign state engaged in hostilities against the United States can also lose citizenship.
Naturalized citizens face an additional path: denaturalization. The Department of Justice can file a civil or criminal case in federal court to revoke naturalization when citizenship was obtained through fraud or concealment of material facts, such as hiding an affiliation with a terrorist organization. Denaturalization happens only by judicial order, and in civil cases the government must prove its case by clear and convincing evidence. Loss of nationality follows a conviction; denaturalization attacks the validity of the original grant. The end result is the same, and the person becomes stateless or a national of whatever other country will have them.
Military Commission or Federal Court
Where a designated person is tried depends largely on citizenship. Military commissions have jurisdiction only over alien unprivileged enemy belligerents, meaning noncitizens who meet the combatant definition.16Office of the Law Revision Counsel. 10 USC 948b – Military Commissions Generally U.S. citizens accused of treason, espionage, seditious conspiracy, or related offenses are tried in federal district courts with full constitutional protections, including jury trial, right to counsel, and confrontation of witnesses. The government cannot route a citizen through a military commission to avoid those protections.
Rights That Still Apply
Even people accused of the most serious offenses against the state retain fundamental legal protections. The Constitution guarantees that habeas corpus cannot be suspended except during rebellion or invasion when public safety requires it.17Constitution Annotated. Article I Section 9 Clause 2 Any person held by the government can challenge the legality of their detention before a judge.
The Supreme Court has drawn firm lines. In Hamdi v. Rumsfeld, the Court held that a U.S. citizen detained as an enemy combatant must receive notice of the factual basis for the classification and a fair opportunity to rebut the government’s evidence before a neutral decisionmaker.18Legal Information Institute. Hamdi v. Rumsfeld The Court acknowledged that national security proceedings can be adapted to protect sensitive information, including through the use of hearsay and rebuttable presumptions favoring the government, but the core right to be heard cannot be eliminated. In Boumediene v. Bush, the Court extended habeas corpus to noncitizen detainees held at Guantanamo Bay, ruling that the Military Commissions Act’s attempt to strip federal courts of jurisdiction over their habeas petitions was an unconstitutional suspension of the writ.19Justia Law. Boumediene v. Bush, 553 US 723 The government cannot avoid constitutional constraints simply by holding detainees outside U.S. borders.