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In page Jacob Penner:

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Following Soviet entry into the war on the side of the British Empire, France, and the United States in the summer of 1941, Penner's incarceration became a cause célèbre, with Winnipeg politicians from across the political spectrum advocating for his pardon, culminating in Penner's release in July 1942.[1] Following his release, Penner joined his Communist Party associates in advocating publicly for the immediate opening of a second front in Europe to take military pressure off the Soviet Union, which was fighting for its survival in the aftermath of Nazi Germany's Operation Barbarossa.