The Soviet leader Nikita Khrushchev had a strong antisemitic streak, and disliked the number of Jews in high positions in the U.S.S.R. "Too many Ambramoviches!" he would complain.
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It has been suggested that one reason why Stalin sponsored the rise of Khrushchev in the later 1930s was that Khrushchev was a genuine working-class ethnic Russian, of whom there were none too many in the Soviet leadership; many of whom were not ethnic Russians (Beria, Mikoyan, Kaganovich, Malenkov, and of course Stalin himself), and those who were ethnic Russians (such as Molotov and Zhdanov) were not working-class in origin. Only after the death of Stalin was the Soviet Union run by ethnic Russians - and went into continuous economic and ideological decline.
(Source: Simon Sebag Montefiore: "Stalin: the Court of the Red Tsar"