Yes, National Socialism (Nazism) and Communism are both forms of
the catch-all term, Fascism.
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Nazism has of course no connection at all with Socialism, which means a classless stateless society based on production for use.
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Nazism is short for National Socialism (Nationalsozialismus in
German). This was the extreme right-wing political movement led by
Adolf Hitler.
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The spelling for the German movement of World War II is "Naziism" (or rarely "Nazism"). The word Nazi comes from the party name Nationalsozialistische Deutsche Arbeiterpartei or National Socialists.