Leber was born in Biesheim, Alsace, out of wedlock, to Katharina Schubetzer and later adopted by her Freemason husband Jean Leber.
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Despite the fact that the case was closed, Bästlein was sent to the concentration camp in Esterwegen and in 1936, to Sachsenhausen, where he met Robert Abshagen, Franz Jacob, Julius Leber, Harry Naujoks, Wilhelm Guddorf and Martin Weise.
Among them were the aforesaid Max Habermann, Hermann Kaiser, Wilhelm Leuschner and Julius Leber as well as Friedrich-Werner Graf von der Schulenburg, former ambassador to Moscow, and Josef Wirmer.