Alien Tort Statute Explained

The Alien Tort Statute is one of the strangest power tools in American law. It is a single sentence written in 1789, largely dormant for almost two centuries, then suddenly revived as a way for foreign plaintiffs to bring human rights cases in U.S. federal courts.

And then the Supreme Court spent the last two decades trimming it back, case by case, until what remains is constrained, technical, and very easy to misunderstand.

The text: 28 U.S.C. § 1350

The Alien Tort Statute, codified at 28 U.S.C. § 1350, reads:

“The district courts shall have original jurisdiction of any civil action by an alien for a tort only, committed in violation of the law of nations or a treaty of the United States.”

Three phrases are doing most of the work here:

• “by an alien”: The plaintiff is typically a non-U.S. citizen (though edge cases like dual nationality and certain entity plaintiffs can complicate things).
• “for a tort only”: This is a civil case (not a criminal prosecution). In practice it often seeks money damages, but the core point is the civil posture.
• “violation of the law of nations or a treaty”: The alleged wrong must violate a recognized norm of international law or a U.S. treaty.

Notice what is missing. The statute does not list specific human rights. It does not define “law of nations.” It does not say where the tort has to occur. It does not specify who can be sued. It is jurisdictional language that opens the courthouse door, but it leaves the rest to the courts.

Why Congress wrote it in 1789

The best way to understand the ATS is to picture a fragile new republic trying to avoid international incidents. In the late 1700s, the United States needed a way to assure other nations that serious violations of international law would have a forum in American courts.

Classic examples in the Founding era included assaults on ambassadors, piracy, and safe-conduct violations. Those were the kinds of “law of nations” offenses that could spark diplomatic conflict if left unaddressed.

There were a handful of early invocations of the statute in the 18th and 19th centuries, but modern ATS litigation was, for the most part, quiet until the late 20th century.

The modern revival: Filártiga

Everything changes in 1980 with Filártiga v. Peña-Irala (2d Cir.). Paraguayan plaintiffs sued a former Paraguayan police official in U.S. court for torture committed in Paraguay. The court allowed the case under the ATS, treating torture as a clear violation of the law of nations.

Filártiga did not come from the Supreme Court, but it set the template for modern ATS human rights cases: plaintiffs using international law norms, enforced through U.S. civil litigation, often when accountability at home was impossible.

Sosa: yes, but narrowly

The Supreme Court addressed the statute directly in Sosa v. Alvarez-Machain (2004). The key holding is both empowering and limiting:

• The ATS is jurisdictional, but it was intended to allow a narrow class of claims based on international law norms.
• Federal courts may recognize causes of action for modern international law violations only if the norm is specific, universal, and obligatory, comparable to the 18th-century paradigms (like piracy).
• Sosa also emphasized judicial restraint: expanding ATS liability is not something courts should do casually, especially where Congress has not spoken.

Sosa is why ATS suits still exist at all. It kept the door open. But it also told lower courts: do not treat this statute as a blank check for every human rights grievance on Earth.

Kiobel: extraterritorial limits

If one case defines the modern limits, it is Kiobel v. Royal Dutch Petroleum (2013). Nigerian plaintiffs alleged that oil companies aided and abetted human rights abuses by the Nigerian government in Nigeria.

The Supreme Court applied the presumption against extraterritoriality, a background rule that says U.S. statutes are generally presumed not to apply to conduct occurring in other countries unless Congress clearly says otherwise.

The Court held that ATS claims cannot be based on foreign conduct merely because plaintiffs found a U.S. courtroom. The now-famous test is that the claims must “touch and concern” the territory of the United States with sufficient force to overcome the presumption against extraterritoriality.

What “touch and concern” means

The phrase sounds flexible, but Kiobel narrowed the field dramatically. After Kiobel:

• Foreign plaintiffs + foreign defendants + foreign conduct is generally close to dead on arrival unless plaintiffs can point to domestic conduct that is central to the alleged violation.
• Allegations that a multinational has a U.S. office, a U.S. listing, or general U.S. business presence are typically not enough.
• Plaintiffs often try to plead a U.S. connection through U.S.-based decisions, financing, training, or direction, but courts frequently treat those as too attenuated unless the domestic conduct is truly tied to the tort itself.

In other words: Kiobel turned the ATS from a global accountability tool into something closer to a U.S.-linked accountability tool.

Corporate liability

Whether corporations can be sued under the ATS has been litigated repeatedly, with plaintiffs often alleging that companies aided and abetted forced labor, extrajudicial killings, or other abuses tied to overseas supply chains or security arrangements.

Jesner: foreign corporations are out

In Jesner v. Arab Bank (2018), the Supreme Court held that foreign corporations cannot be defendants in ATS suits. The Court emphasized separation of powers and foreign relations concerns, warning that ATS corporate litigation could create international friction.

What about U.S. corporations?

Jesner did not squarely decide whether U.S. corporations can be sued. That question remains contested in lower courts, with outcomes varying by jurisdiction and case posture. It is also tangled up with two additional Supreme Court themes:

• Judicial caution: the Court repeatedly signals that expanding ATS causes of action is a job for Congress, not federal judges.
• Domestic conduct requirements: even if a U.S. corporation can be sued, Kiobel and later cases still require a strong U.S. nexus.

Nestlé and Cargill: more than “corporate activity”

In Nestlé USA, Inc. v. Doe (2021), plaintiffs alleged that U.S. companies aided and abetted child slavery on cocoa farms in Ivory Coast. The Court rejected the claim as pleaded, holding that general allegations of U.S.-based corporate decision-making were insufficient. The relevant conduct was overwhelmingly abroad, and the domestic conduct alleged was too generic.

The decision was fractured, but the practical signal was clear: courts will look hard at where the conduct at the core of the claim occurred, and routine headquarters-level activity will not, by itself, transform overseas abuses into a domestic ATS case.

What counts as “law of nations”?

Even if a case clears the geography and defendant hurdles, an ATS claim still needs a qualifying international law norm under Sosa. Courts generally look for norms that are:

• Specific: defined with clear content, not vague moral language.
• Universal: widely accepted across legal systems and international practice.
• Obligatory: treated as binding, not aspirational.

Historically viable categories often include allegations like torture, genocide, war crimes, crimes against humanity, extrajudicial killing, slavery and forced labor (often treated as a cluster of related norms), and piracy. But viability depends heavily on how the claim is framed, and on whether the asserted norm clearly supports the particular theory of liability the plaintiff is using (such as aiding and abetting).

Aiding and abetting

Many ATS suits do not accuse the defendant of personally committing torture or killings. They allege secondary liability: financing, facilitating, directing, or knowingly assisting abuses committed by others.

Courts have debated two big questions:

• Is aiding and abetting available under the ATS? Many courts have assumed it can be, but the Supreme Court has been cautious about endorsing broad secondary liability.
• What mental state is required? Some approaches look for purpose to facilitate the abuse; others treat knowledge as sufficient. The stricter the mens rea, the harder the case is to plead and prove. (The purpose-versus-knowledge divide has shown up sharply in circuit-level ATS cases.)

This is where ATS litigation often turns from moral narrative into technical doctrine: what exactly did the defendant do, where did they do it, and what did they intend?

TVPA: the statutory companion

One reason the Court is cautious about expanding the ATS is that Congress has enacted a targeted human rights civil remedy: the Torture Victim Protection Act (TVPA) (1991). The TVPA creates an explicit cause of action for torture and extrajudicial killing, but it is aimed at individuals, not corporations. In practice, ATS and TVPA theories sometimes travel together, and the TVPA can shape how courts think about whether additional judge-made ATS claims are necessary.

What remains viable today

After Sosa, Kiobel, Jesner, and Nestlé, the ATS is not dead. But it is narrow. The most viable ATS cases tend to share several features:

• A strong U.S. territorial connection: key conduct in the United States that is tied directly to the international law violation, not just routine corporate oversight.
• An individual defendant present in the United States: historically common in torture cases where the alleged perpetrator later resides or is found here.
• A clearly recognized international law norm under Sosa, framed in a way that is specific and not novel.
• A defendant that is not a foreign corporation (because Jesner bars those).

What is generally not viable

• “Everything happened abroad” cases dressed up with a U.S. mailing address.
• Claims against foreign corporate defendants, even when the allegations are severe.
• Broad, policy-driven claims that ask courts to recognize new international norms or expand liability without clear international consensus.

Other practical hurdles

Even a well-pled ATS theory can run into ordinary litigation barriers that have nothing to do with international law in the abstract. Defendants often fight over personal jurisdiction, argue that another country is the more appropriate forum (forum non conveniens), and challenge whether the complaint plausibly alleges causation and the required mental state, especially in aiding-and-abetting cases.

ATS vs. § 1983 and Bivens

It is tempting to treat the ATS as just another civil rights statute. It is not.

• 42 U.S.C. § 1983 targets state actors who violate federal rights under color of state law.
• Bivens is a judge-made remedy (and a shrinking one) for certain constitutional violations by federal officers.
• The ATS is about non-U.S. plaintiffs suing for torts that violate international law norms, and it comes with foreign relations and extraterritoriality concerns baked into every step.

That is why the Supreme Court treats ATS expansion as a separation of powers problem. The Court repeatedly signals that if the United States wants a broader human rights civil remedy, Congress should write it.

Why this one sentence matters

The Alien Tort Statute is a civics lesson disguised as jurisdiction. It shows how American courts manage the boundary between domestic law and international norms, and how quickly a powerful doctrine can be narrowed when it starts to look like foreign policy by lawsuit.

In the early ATS revival era, the question was whether U.S. courts could be a global forum for human rights accountability. After Kiobel and its successors, the question is narrower and more American: when does a human rights violation become enough of a U.S. case to belong in a U.S. court?

That question is not just legal. It is institutional. It is about what kind of judiciary we want, what role Congress should play, and whether international law enters our system through democratic legislation or through litigation at the courthouse door.

Quick takeaways

• The ATS is a jurisdiction statute allowing suits by non-citizens for torts violating international law or treaties.
• Sosa permits only a narrow class of claims based on specific, universal, obligatory international norms, and it urges judicial restraint.
• Kiobel sharply limits extraterritorial cases: claims must “touch and concern” the United States with sufficient force.
• Jesner bars ATS suits against foreign corporations.
• Nestlé signals that generic U.S. corporate activity is not enough to transform overseas abuses into domestic ATS cases.
• The TVPA provides an explicit statutory cause of action for torture and extrajudicial killing against individuals, and it often sits in the background of ATS debates.