"7000 days in Siberia" written by Karlo Stajner (C(K)arlo Steiner).
True story. Austrian communist that worked in Austrian and Yugoslavian communist party finally ends up in USSR. Tensions before ww2 are building up and he gets accused of being a gestapo agent and sent to Siberia. A book about twenty years he spent there.
I don't know how much this book is known around the world but it is definitly worth reading. There are several copies on Amazon, and I also think german version shouldn't be too hard to find...
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