Adolf Hitler's bodyguard
When Hitler returned to Munich from military service in 1918, he became a member of the Nazi Party, an extremist far-right political party in Bavaria. In 1921, he was elected leader of the party. As his speeches promoted violence and racism, Hitler needed permanent security.
Heinrich Müller (Gestapo)
Müller became a member of the Nazi Party in 1939 for the purely opportunist reason of improving his chances of promotion and only after Himmler insisted he do it. Historian Robert Gellately does not give much credence to this apolitical image of Müller and cites the musings of Walter Schellenberg, who claimed that during a conversation with Müller sometime in 1943, that Müller lauded the Stalinist system as superior to Nazism, which he believed compromised on too much. Schellenberg even alleged that when Müller compared Stalin against Hitler, his (Müller's) opinion was that, Stalin did things better. As Gellately relates, such a politically-oriented asseveration certainly indicates Müller did indeed have preferences. Another indicator along this vein—Müller was notorious for his admiration of the Soviet police.