...., in 1933 when Adolf Hitler and the National Socialist regime came to power amid a conservative majority cabinet...
This is how ignorant modern society is of the 1930's. Nazi's were not conservative, they were committed European Socialist, but wanted to keep and maintain national boarders. Mussolini, the father of national socialism, was a communist until he was kicked out of the party for not opposing WWI- he believed in nationalism.
However, the author's own sentence is a contradiction... how can a Socialist party come to power with a conservative majority?
I think the word games about National Socialism being a left of center party because it had the word Socialism in the title is not a winning argument for our side.
Now certainly it is not easy to map the German political spectrum of 1933 onto a the US body politic, indeed to do so in any sense is ludicrous, but Hitler’s hatred of the Communists and Socialists in Germany was absolute, and he specifically chose the title National Socialists in order to be misleading about his political agenda with the lower classes in Germany who were favorably disposed to the Socialist ideas. If the Socialists and Communiste were “Left”, then the Nazis were decidedly Right, and bonded themselves tightly with corporate and military interests, as was classic to the political Right in that time and place.