Israel van Loen was a son of Barend van Loen and Debora Querido. He was divorced from Gesina van Kolm. He had two children with her.
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Israel van Loen was a prominent communist. In 1939 he was head administrator of the 'Vereeniging van Vrienden der Sovjet-Unie' (Organisation of Friends of the Soviet Union). He visited the Soviet Union. In the Netherlands he spoke in public.
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