For those interested in federal courts or U.S. foreign relations law, the Supreme Court just issued an important decision in Kiobel v. Royal Dutch Petroleum Co. The basic issue concerned the extent to which the Alien Tort Statute (“ATS”) confers jurisdiction upon district courts to recognize a federal cause of action for violations of customary international law. Here’s what happened: Nigerian nationals sued Royal Dutch Petroleum in federal court for aiding and abetting atrocities allegedly committed by the Nigerian military in the early 1990s, when the plaintiffs and many others were protesting the environmental effects of the oil company’s operations in the Niger River Delta. The district court dismissed some of the claims on the ground that the alleged conduct did not violate international law. On appeal, the Second Circuit dismissed the entire complaint on the view that the ATS does not recognize corporate liability. Many thought that the Supreme Court would affirm on similar reasoning, but the Court mostly sidestepped the issue of corporate liability to focus instead on whether the ATS confers jurisdiction over claims alleging violations of international law when the unlawful acts occurred within the territory of a foreign sovereign.