Well, Sowell does illustrate the origins of the fascisti and National So******ts. But today, these terms (fascist and Nazi) are used as pejoratives than left/right indicators. We abuse the term "liberal" and "progressive", both of which are good-sounding words, to mean "socia1ist".
Jonah Goldberg's "Liberal Fascism" is an outstanding book, by the way.
For me, it doesn't matter who wants to impose their will on me, whether they count themselves among the left or the right.