Otto Strasser
Otto Johann Maximilian Strasser was a German politician and member of the Nazi Party. Otto Strasser, together with his brother Gregor Strasser, was a leading member of the partys leftwing faction, and broke from the party due to disputes with the Hitlerite faction. He formed the Black Front, a group intended to split the Nazi Party and take it from the grasp of Hitler. This group also functioned during his exile and World War II as a secret opposition group.
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Source: Wikipedia