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In 1930, Ernst Kaltenbrunner, a future high-ranking Nazi official and the chief of the Sicherheitsdienst (SD), joined the Nazi Party. He quickly rose through the ranks due to his loyalty and devotion to the Nazi cause. Known for his ruthlessness and unwavering commitment to Hitler, Kaltenbrunner played a significant role in the Nazi regime, particularly in the persecution of Jews and other marginalized groups during World War II.