Question: What was the nickname of the Soviet defector to the United States in 1967 who was married to the Russian chemistry professor and rector Yuri Zhdanov?

<P0-S0> Valery Vorona (Russian: "Валерий Ворона" ) is a Russian violinist, soloist, conductor, and Meritorious Artist. <P0-S1>  Vorona graduated from the Gnessin State Musical College and was a post-graduate student at the Moscow Conservatory where he later became a professor. <P0-S2>  Later on he became a conductor and teacher in positions which added to his career. <P0-S3>  Currently he is both artistic director and conductor-in-chief of the Moscow Chamber Orchestra for young violinists as well as a soloist of the Moscow Philharmonic Orchestra and a President of the Russian Performing Art Foundation. <P0-S4>  He also serves as a rector at the Ippolitov-Ivanov Mupic Pedagogical Institute and by 2008 became both conductor and soloist of the Saint Petersburg International Economic Forum. <P0-S5>  He has participated at various festivals such as the Russian Festival in San Francisco as well as "Vladimir Spivakov Festival" and Sakharov Festival in Nizhny Novgorod. <P0-S6>  Besides national performances he has also performed overseas in such countries as France, Greece, Israel, Italy, Spain, the United States and various former Soviet republics. <P0-S7>  He has appeared with many well-known conductors including Ukrainian Oleh Krysa and Oleksandr Bondurianskyi and the Russian conductors Valentin Berlinsky, Vladimir Ponkin, Vladimir Repin, Yuri Bashmet, and Maxim Vengerov. <SEP> <P1-S0>  In 1967, she caused an international furor when she defected and became a naturalized citizen of the United States. <P1-S1>  In 1984, she returned to the Soviet Union and had her Soviet citizenship returned. <P1-S2>  She later went back to the United States and also spent time in France, before settling in the United Kingdom and becoming a British citizen in 1992. <P1-S3>  She was the last surviving child of Stalin. <P1-S4> Svetlana Iosifovna Alliluyeva (Russian: Светла́на Ио́сифовна Аллилу́ева , Georgian: სვეტლანა იოსებინა ალილუევა ; 28 February 1926 – 22 November 2011) (born Svetlana Iosifovna Stalina, Russian: Светла́на Ио́сифовна Сталина , Georgian: სვეტლანა იოსებინა სტალინა ), later known as Lana Peters, was the youngest child and only daughter of Soviet Premier Joseph Stalin and Nadezhda Alliluyeva, Stalin's second wife. <SEP> <P2-S0> The Zhdanov Doctrine (also called zhdanovism or zhdanovshchina, Russian: доктрина Жданова, ждановизм, ждановщина ) was a Soviet cultural doctrine developed by Central Committee secretary Andrei Zhdanov in 1946. <P2-S1>  It proposed that the world was divided into two camps: the "imperialistic", headed by the United States; and "democratic", headed by the Soviet Union. <P2-S2>  The main principle of the Zhdanov doctrine was often summarized by the phrase "The only conflict that is possible in Soviet culture is the conflict between good and best". <P2-S3>  Zhdanovism soon became a Soviet cultural policy, meaning that Soviet artists, writers and intelligentsia in general had to conform to the party line in their creative works. <P2-S4>  Under this policy, artists who failed to comply with the government's wishes risked persecution. <P2-S5>  The policy remained in effect until the death of Joseph Stalin in 1953. <SEP> <P3-S0>  He was the son of Soviet politician Andrei Zhdanov and a former husband of Joseph Stalin's daughter, Svetlana Alliluyeva. <P3-S1> Yuri Andreyevich Zhdanov (Russian: Ю́рий Андре́евич Жда́нов ; 20 August 1919 – 19 December 2006) was a Russian chemistry professor and rector of the University of Rostov.