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In page Maria Osten:

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The family's fate, however, changed, when Joseph Stalin began to purge the party ranks. Koltsov was arrested in December 1938 following a denunciation filed by André Marty and executed about a year later, and the book disappeared from circulation. Hubert then refused to recognize his adoptive parents and told his adoptive mother to leave him. In 1941, Osten was arrested in the hotel Balchug; she was executed in Saratov prison on September 16, 1942.[citation needed]