She headed the courier section of the Comintern's OMS (International Liaison Department) in Moscow in 1935 and was summarily executed during the Great Purge in 1937.
[1] Zimmermann was born in Zürich, Switzerland, to a Protestant family on September 27, 1902.
[1] In 1923, Zimmermann emigrated from Switzerland to the Soviet Union, where she worked for the Comintern.
[1] Zimmermann was married to Fritz Platten, a fellow communist also of Switzerland.
[1][2] Platten was arrested in 1938, moved to a prison camp near Nyandoma in 1939, and shot on 22 April 1942.