Fascism is a form of far-right, authoritarian ultranationalism characterized by dictatorial power, forcible suppression of opposition and strong regimentation of society and of the economy which came to prominence in early 20th-century Europe.
Other than the definitions always include the term "far right" the description sounds just like our left.
The original meaning of Fascism had nothing to do with authoritarianism. It was about nationalism, strong borders and standing against communism. No dictator, no matter how stupid, would use a word thats scary like that to take power. And those dictators were great at PR
Research the two italians who made the philosophy of fascism.
Here a tid bid both of them were socialist who discover international socialism could never work since people identify with their nation more then their class. Which became clear from the outbreak of WW 1