The Supreme Court’s conservatives dealt a major blow Wednesday to the ability of American federal courts to hold violators of international human rights accountable. The court declared that a 1789 law called the Alien Tort Statute does not allow foreigners to sue in American courts to seek redress “for violations of the law of nations occurring outside the United States.”

In the case at issue, Kiobel v. Royal Dutch Petroleum, Nigerian citizens alleged that, from 1992 to 1995, multinational oil companies working in Nigeria aided the military dictatorship that tortured and killed protesters who fought the environmental damage caused by the oil operations. These companies did business in the United States. But Chief Justice John Roberts Jr., writing for the majority, said that even where claims of atrocities “touch and concern the territory of the United States, they must do so with sufficient force” to overcome a presumption that the statute does not apply to actions outside this country.

That presumption radically revises and undermines the way the statute has been applied for a generation. It has been limited by the types of human rights abuses it covers — but not by where they take place. The effect is to greatly narrow the statute’s reach.

The court’s four moderate liberals, in an opinion by Justice Stephen Breyer, agreed with the majority that the Kiobel case should not go forward in an American court. The conduct in this case happened abroad, Justice Breyer wrote, and “based solely upon the defendants’ minimal and indirect American presence,” it would be “far-fetched to believe” the case “helps to vindicate a distinct American interest.”