Look dude, Fascism is a leftist ideology, period. You aren’t paying attention bozo.
You really need to go beyond Jonah Goldberg's sound bites and learn some history.
The very definitions of "Left" and "Right" go back to the French Revolution, when the radical anti-monarchists with their mantra of liberte, egalite, fraternite sat on the Left aisles of the National Assembly while the conservative monarchists sat in the Right aisles. From then on, "Left" and "Right" were not defined in terms of the size of government, but by whether the political movements worked to overthrow the traditional hierarchy of the aristocracy, the Church, and the landowner classes vs. upholding them in some form. By this and any reasonable historical definition, fascists were reactionary right-wing movements while Communists and Socialists were radical left-wing movements.
The first thing Bolsheviks and other Communists did when they came to power is line up aristocrats, military officers, and clergymen in front of firing squads. In contrast, fascists presented themselves as defenders of the aristocracy, the Churches, the military officers, as well as the bankers and industrialists.
If, as you and Goldberg argue, Communism and Fascism are "the same," perhaps you could explain why it is that when Fascists came to power, the first thing they did was crack down on labor unions and restore property to landowners and noblemen, while the first thing Communists did was to seize the property of aristocrats and landowners and give them to "worker's communes."
Now, as to the counterargument that Fascism and Communism are both anti-individualistic and authoritarian, the response is that this has nothing to do with Left or Right-wing ideology. The military in general and the Marine Corps in particular are profoundly anti-individualistic. Does that make the USMC a "Left Wing" institution? Theocratic governments and absolute monarchies from the 17th and 18th centuries were authoritarian, but I've yet to hear Louis XIV or Frederick the Great called "left-wing radicals." I doubt they'd have much in common with Karl Marx.