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In page Zinaida Volkova:

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In January 1931, Joseph Stalin allowed Volkova to leave the Soviet Union to join her father, Leon Trotsky, in exile. She was allowed to take one family member with her, and she took her son Vsevolod with her, leaving her daughter Alexandra in Russia with the girl's father. On 20 February 1932, the Soviet citizenship of Volkova and Vsevolod was revoked by Stalin, preventing their return to the Soviet Union. The Soviet citizenship of Trotsky, Natalia Sedova and Lev Sedov, were also revoked on the same day.[citation needed]