Today I started reading Liberal Fascism by Jonah Goldberg. Goldberg defines fascism as "a religion of the state. It assumes the organic unity of the body politic and longs for a national leader attuned to the will of the people."
On the page 392, Goldberg gives a clue for why he wrote the book: "Ever since I joined the public conversation as a conservative writer, I've been called a fascist and a Nazi by smug, liberal know-nothings, sublimely confident of the truth of their ill-informed prejudices. Responding to this slander is, as a point of personal privilege alone, a worthwhile endeavor."
Goldberg presents evidence for close links between progressivism and fascism. "Progressivism was a sister movement of fascism, and today's liberalism is the daughter of Progressivism."