Nazism is a Capitalist response to left wing organization in order to violently suppress it, and ensure the existing ruling class does not lose power.

Well, not exactly. I can see why many of us have this oversimplified view of Fascism (it was my own for a while), but as respectable as our numbers were in the Kingdom of Italy and the Weimar Republic, we were still too minor to ensure a revolution. Rather, preventing capitalism’s collapse by any means necessary—saving it from its own contradictions—was the ruling class’s main motive for institutionalizing Fascism. Listen to this monologue by Michael Parenti or read Daniel Guerin’s Fascism and Big Business for the details.