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Rosenberg joined the group in Marseille at the age of seventeen. That was 1921+17=1938 at most 1939. WWII broke out September 1939. The Emergency Rescue Committee came into action in 1940.

So, that makes no sense. -- Goesseln ( talk) 20:47, 14 November 2021 (UTC) reply

In fact, he wasn't. He was born in Danzig, at that time Freie Stadt Danzig, which was not a part of Poland.-- Altaripensis2 ( talk) 17:50, 15 November 2021 (UTC) reply

See also Free City of Danzig. According to a German newspaper article, he was born into a secular Jewish family which spoke German at home. [ [1]] -- 2003:E5:171F:44E9:E051:BCE2:349B:33CB ( talk) 21:30, 15 November 2021 (UTC) reply