"You can't be both a communist and a Nazi. Nazism is a right wing political movement." - Morality Games
Nazi (National Socialist German Workers Party) is a socialist, therefore, left-wing political movement.
Communism is also a left-wing ideology.
Both are responsible for the oppression and murder of millions and millions of their own people.
These are both wonderful examples of how left-wing ideology is oppressive, totalitarian and savage.