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In page Natalia Sedova:

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After her husband's assassination in 1940, Natalia Sedova remained in Mexico and maintained contact with many exiled revolutionaries. Her best-known work in these last years was a biography of Trotsky, which she co-authored with fellow Russian revolutionary Victor Serge. She was also close to the Spanish revolutionary Grandizo Munis who had led the tiny Spanish Sección Bolchevique-Leninista during the revolutionary events in the 1930s. Under his influence,[citation needed] she came to adopt the position that the USSR was state capitalist and that the Fourth International founded by Trotsky no longer held to the revolutionary programme of Communism. Therefore, she broke from the FI in 1951.[3]