Svetlana Iosifovna Alliluyeva, later known as Lana Peters, was the youngest child and only daughter of Soviet leader Joseph Stalin and his second wife Nadezhda Alliluyeva. In 1967, she caused an international furor when she defected to the United States and, in 1978, became a naturalized citizen. From 1984 to 1986, she briefly returned to the Soviet Union and had her Soviet citizenship reinstated. She was Stalin's last surviving child.