The question could also be "How did Hitler / The Nazis stay in power?" or after 1933.
Burning of Reichstag 1933 Hitler blamed the communists and arrested 4000, he rounded up many more and sent them to concentration camps.
Election enabling act - Made by Hitler and meant that only Nazi propaganda was allowed. The Enabling act in general meant Hitler could make laws without consulting the president - .
Night of the Long Knifes - Rohm was the leader of 4 million SA men. Hitler accused Rohn of plotting to overthrow him and killed him and 400 others. Hitler now had all the army on his side.
When president Hindemburg died Hitler took over as president.