Nazism

(uncountable) The ideology of the Nazi Party (the National Socialist German Workers' Party or NSDAP), being a form of fascism characterised by Adolf Hitler's cult of personality, hate propaganda, white supremacy, extreme bigotry (especially antisemitism and racism), eugenics, mass violence, genocide, ethnonationalist territorial expansion (Lebensraum) and state capitalism.
(uncountable) The ideology of derived, copycat or other neo-Nazi groups that support most or all of that ideology.