Answer:
Totalitarianism is a form of government, where when anyone speaks up against the government, they get shot. People supported totalitarian leaders like Hitler, because they believed (in Hitler's supporters case) that the Jews had stabbed Germany in the back after WWI, that communists had done the same, that the Treaty of Versailles was unfair to Germany, that the Weimar Republic was ineffective, that Germans were separated from each other (after the border changes of WWI), and thus should be reunited. They also believed that Hitler was some great savior of Germany.