This memorial plaque commemorates Arvid and his American wife Mildred Harnack. The couple organised anti-fascist courses and political discussion groups on the fourth floor of this building in their home. This marked the beginning of the resistance circle of which this couple and married couple Harro and Libertas Schulze-Boysen formed the hub.
More than 130 members of the resistance group, referred to by the Nazis as Rote Kapelle, were arrested by the Gestapo in the summer of 1942. 49 of them were put to death by hanging in Plötzensee prison. These included Arvid and Mildred Arnack: he on 22 December 1942, she on 16 February 1943.
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