[dfwgator]

It was Stalin who called the Nazis “Right Wing”. The Communist front groups in the West repeated the new Stalin-approved definition.

Stalin always referred to the Nazis as "Fascists", calling them "Nazis", or "National Socialists", would have been admitting that they were fellow socialists.

[Army Air Corps]

That was only after they ceased to be chummy. Prior to that, the USSR saw Fascism is the bridge from late-stage capitalism to “pure” socialism.