Forty years ago, it was customary for leftist students to denounce Richard Nixon's White House and those who supported him as "fascist pigs." The students who threw this adjective around hadn't bothered to research it, and didn't really understand fascism any better than they understood any political system. They just knew that "fascist" was a word associated with right wing regimes, and that it was fashionable to hate anything conservative.
But here is the definition of "fascist," from Wiktionary:
"A political regime, having totalitarian aspirations, ideologically based on a relationship between business and the centralized government, business-and-government control of the market place, repression of criticism or opposition, a leader cult and exalting the state and/or religion above individual rights. Originally only applied (usually capitalized) to Benito Mussolini's Italy."