Leo Steinweg was married to a non-Jewish woman. He fled Germany in the 1930s. During the war, he was able to visit his mother-in-law in Gleiwitz occasionally, because of his job as an auto mechanic. Leo Steinweg was arrested and deported. From November 1942 to January 1945, he was held in a series of concentration camps, including Auschwitz. After a long death march, he arrived at Flössenburg concentration camp, where he was put to work in the Himmelfahrt-Kommando quarry.
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See also his biography on internet.