Kawakita v. United States, 343 U.S. 717 (1952), is a United States Supreme Court case in which the Court ruled that a dual U.S./Japanese citizen could be convicted of treason against the United States for acts performed in Japan during World War II. Tomoya Kawakita, born in California to Japanese parents, was in Japan when the war broke out and stayed in Japan until the war was over. After returning to the United States, he was arrested and charged with treason for having abused American prisoners of war. Kawakita claimed he could not be found guilty of treason since he had lost his U.S. citizenship while in Japan, but this argument was rejected by the courts (including the Supreme Court), which ruled that he had in fact retained his U.S. citizenship during the war. Originally sentenced to