Because Jews are the primary enemy in Nazi ideology, and the idea of communism being a Jewish plot was an existing antisemitic belief well before Hitler was a k

Because Jews are the primary enemy in Nazi ideology, and the idea of communism being a Jewish plot was an existing antisemitic belief well before Hitler was a known entity in Germany's political scene: https://en.wikipedia.org/wiki/Jewish_Bolshevism https://en.wikipedia.org/wiki/Jewish_Bolshevism