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In page History of Esperanto:

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In the early years of the Soviet Union, Esperanto was given a measure of government support, and an officially recognized Soviet Esperanto Association came into being.[6] However, in 1937, Stalin reversed this policy and the use of Esperanto was effectively banned until 1956.[6] While Esperanto itself was not enough cause for execution, its use was extended among Jews or trade unionists and encouraged contacts with foreigners.[citation needed]