Federal Neutrality Laws and Foreign Relations Crimes — The Logan Act, Foreign Agent Prohibition, and Neutrality Acts

The United States maintains a set of criminal statutes — some dating to the early republic — that govern private citizens' ability to conduct unauthorized diplomacy, act in the United States under the direction of a foreign government without notification, enlist in foreign military service from U.S. territory, or launch hostile enterprises against countries at peace with the United States. The best-known of these is the Logan Act (18 U.S.C. § 953), but in practical modern enforcement 18 U.S.C. § 951 and 18 U.S.C. § 956 have mattered far more. Together with the neutrality laws (§§ 958-967) and the protection of foreign government property (§ 970), these statutes in Chapter 45 of Title 18 help define the line between private international activity and criminal interference with U.S. foreign-relations prerogatives. See FARA / Lobbying Disclosure for the related civil foreign-agent registration framework and Espionage Act for the classified-information criminal statutes.

Current Law (2026)

Legal Authority

• 18 U.S.C. § 951 — Agents of foreign governments: it is a crime for any person (other than a diplomatic or consular officer) to act in the United States as an agent of a foreign government without first notifying the Attorney General; "agent of a foreign government" means any individual who agrees to operate at the direction or control of a foreign government or official; the statute requires only that the defendant received and agreed to follow direction, not that any specific harmful act occurred
• 18 U.S.C. § 952 — Diplomatic codes: a U.S. government employee who willfully communicates an official diplomatic code or any matter of which the person has custody because of official employment — or who aids such communication — commits a felony; this provision protects the confidentiality of diplomatic communications
• 18 U.S.C. § 953 — Logan Act: a U.S. citizen, wherever located, who directly or indirectly communicates with a foreign government or officer with intent to influence the measures or conduct of that government in relation to any disputes or controversies with the United States, or who defeats the measures of the United States, commits a crime; the statute has been on the books since 1799 and no one has ever been successfully prosecuted under it
• 18 U.S.C. § 956 — Conspiracy to kill, kidnap, maim, or injure persons or damage property in a foreign country: anyone in the United States who conspires with one or more persons to commit at any place outside the United States an act that would constitute a murder, kidnapping, or maiming of an individual, or an act that would be a federal crime of violence if committed within U.S. jurisdiction; carries life imprisonment if death results
• 18 U.S.C. § 958 — Commission to serve against a friendly nation: U.S. citizens who accept commissions to serve in the armed forces of a nation at war with a country at peace with the United States, or who enlist others for such service, face up to 3 years imprisonment; reflects the traditional law of neutrality
• 18 U.S.C. § 959 — Enlistment in foreign service: enlisting or entering into agreement in the United States to serve in the armed forces of a foreign nation, or recruiting or hiring others to enlist, is a federal crime; applies regardless of whether the individual actually departs
• 18 U.S.C. § 960 — Expedition against a friendly nation: knowingly beginning, providing the means for, or participating in a military expedition or enterprise from the United States against a nation at peace with the United States is a federal crime; this is the statutory expression of the neutrality principles that date to Washington's Neutrality Proclamation of 1793
• 18 U.S.C. § 962 — Arming vessels against a friendly nation: fitting out or arming a vessel, or procuring its fitting or arming, within the United States with intent that it will be used to commit hostilities against a nation at peace with the United States is a felony
• 18 U.S.C. § 970 — Protection of foreign government property: willfully damaging, destroying, or attempting to damage or destroy any property within the United States belonging to, used by, or occupied by a foreign government, international organization, or foreign official is a federal crime; protects foreign embassies, consulates, and diplomatic missions

How It Works

These statutes cover very different conduct despite sitting in the same chapter. 18 U.S.C. § 951 prohibits acting as an undisclosed agent of a foreign government inside the United States — a criminal prohibition distinct from FARA, which is primarily a disclosure regime. FARA registration can satisfy the § 951 notification requirement in qualifying cases, but the two schemes are independent. § 953 (the Logan Act) addresses unauthorized private diplomacy by U.S. citizens with foreign governments in dispute with the United States — it remains federal law but has produced only two indictments in U.S. history and no successful prosecution. The neutrality provisions (§§ 958–962) target military recruiting, organizing armed expeditions, and outfitting vessels from U.S. territory against nations at peace with the United States — they are territorial and conflict-sensitive, with enforceability turning on the geopolitical posture between states as much as on defendant conduct. § 956 has by far the most modern enforcement relevance: it reaches violent conspiracies formed in the United States for attacks abroad and is regularly deployed in terrorism and transnational-violence prosecutions alongside anti-terrorism material support statutes. The specific offense structures below detail each category.

The Logan Act: Famous but Untested

The Logan Act (§ 953) has been law since 1799, when Congress enacted it in response to Quaker diplomat George Logan's unauthorized mission to France to negotiate peace without authorization. Despite being on the books for more than two centuries, no one has ever been convicted under it. There have been only two indictments — one in 1803 and one in 1852 — neither of which resulted in prosecution.

The Act came to prominent public attention in 2016-2017 when federal investigators examined whether Michael Flynn's communications with Russian Ambassador Sergey Kislyak before the Trump administration took office might violate the Logan Act. Flynn was ultimately prosecuted for making false statements (18 U.S.C. § 1001), not for the Logan Act itself. Legal scholars have debated whether the Logan Act is unconstitutional under the First Amendment and whether it applies to private foreign policy discussions as opposed to actual diplomatic negotiations. Its continued existence generates controversy each time a prominent figure conducts foreign policy outside official channels.

Section 951: The More Functional Foreign Agent Statute

Unlike the Logan Act, 18 U.S.C. § 951 — prohibiting acting as an unregistered agent of a foreign government — has been used in actual prosecutions. Section 951 covers any person who agrees to operate at the direction of a foreign government without disclosing this relationship to the Attorney General. Unlike the Foreign Agents Registration Act (FARA, beginning at 22 U.S.C. § 611), which is primarily a registration and disclosure regime for agents of foreign principals, § 951 is a criminal prohibition on undisclosed foreign-government agency. The statute does not require proof of any specific harmful act — only that the defendant knowingly acted under foreign-government direction in the United States without the required notification.

Section 951 has been used in espionage-adjacent prosecutions and other foreign-influence cases where individuals allegedly acted in the United States under the direction or control of foreign intelligence services or foreign officials.

Neutrality Laws: Pre-Civil War Statutes Still in Force

The neutrality provisions in §§ 958–967 codify the United States' longstanding policy of prohibiting private citizens from engaging in military activities on behalf of foreign countries at war with each other. These statutes derive from the Neutrality Acts of the early republic and reflect the executive's interest in controlling the conduct of foreign policy — only the U.S. government may make war or peace, not private citizens. The provisions against arming vessels (§ 962), enlisting in foreign service (§ 959), and organizing expeditions against friendly nations (§ 960) have seen sporadic use when American mercenaries or gun-runners have become entangled in foreign conflicts.

How It Affects You

If you are involved in international business, advocacy, or diplomacy: The Logan Act's broad language technically covers any American citizen who contacts a foreign government with intent to influence its conduct regarding U.S. disputes — which could include everything from business negotiations to academic exchange to advocacy work. In practice, the Act has never been prosecuted and is widely regarded as a political tool more than a real criminal threat. However, Section 951 (undisclosed foreign government agents) carries real criminal risk for anyone who agrees to operate at the direction of a foreign government without disclosure.

If you work in foreign policy advocacy or lobbying: The line between FARA registration requirements and § 951 criminal exposure can blur for individuals or organizations that take direction from foreign governments. FARA requires registration and disclosure; § 951 criminalizes secret agency. Understanding where your activities fall is important for compliance.

If you serve in the U.S. government or military: Section 952's prohibition on disclosing diplomatic codes applies directly to government employees with access to diplomatic communications. Section 970's protection for foreign government property (embassies, consulates) affects how law enforcement may respond to protests or attacks on diplomatic premises.

If you are a dual citizen or have ties to a foreign government: Acting at the direction of a foreign government without disclosure to U.S. authorities exposes you to § 951 prosecution even for activities that might seem innocuous — gathering information, making introductions, influencing opinions. The statute does not require proof of harm. Parallel civil registration obligations under FARA may also apply, and in the rare case of removal based on classified national-security grounds the framework at Alien Terrorist Removal Procedures comes into play.

State Variations

These are overwhelmingly federal crimes because foreign relations and neutrality are federal subjects. States can still prosecute overlapping conduct under generally applicable criminal laws such as assault, vandalism, weapons offenses, conspiracy, trespass, or property damage, but they do not control the core federal foreign-relations offenses themselves.

Implementing Regulations

• No large standalone CFR regime governs most of these core criminal prohibitions: The key authorities are the statutes themselves, charging practice, and DOJ guidance.
• 18 U.S.C. § 951(b) — The statute directs the Attorney General to establish notification requirements for foreign-government agents.
• DOJ/FARA Unit guidance — DOJ states that FARA registration can satisfy the notification requirement for qualifying § 951 situations, and DOJ's FARA-related-statutes guidance is the clearest public-facing implementation source for this overlap.

Pending Legislation (119th Congress)

As of April 8, 2026, no enacted federal law has materially rewritten the core Chapter 45 foreign-relations offenses summarized here. Congress periodically debates FARA reform, foreign-influence enforcement, and national-security charging tools more broadly, but the current-law framework for § 951, the Logan Act, and the neutrality provisions remains substantially the longstanding statutory structure described above unless Congress enacts a change.

Recent Developments

• As of April 8, 2026: The most important practical current-law point is that § 951 remains the more active undisclosed-foreign-government-agent statute, while the Logan Act remains famous but essentially untested in modern criminal practice.
• DOJ public guidance continues to distinguish FARA from § 951: DOJ's National Security Division continues to describe FARA as a disclosure regime and § 951 as a separate criminal prohibition on foreign-government agency without the required notification.
• Section 956 remains the most operationally relevant "foreign conduct" charge in this cluster: In modern practice it is often more consequential than the old neutrality provisions because it is used in terrorism and cross-border violence cases where the conspiracy is formed or directed from the United States.
• The neutrality statutes remain on the books but are comparatively rare charging tools: They still matter most in unusual cases involving recruiting, armed expeditions, or vessel outfitting from U.S. territory against a country at peace with the United States.