It was in the 1930s, when ugly internal and international actions by Hitler and Mussolini repelled the world, that the left distanced themselves from fascism and its Nazi offshoot -- and verbally transferred these totalitarian dictatorships to the right, saddling their opponents with these pariahs.
What socialism, fascism and other ideologies of the left have in common is an assumption that some very wise people -- like themselves -- need to take decisions out of the hands of lesser people, like the rest of us, and impose those decisions by government fiat.
The left's vision is not only a vision of the world, but also a vision of themselves, as superior beings pursuing superior ends. In the United States, however, this vision conflicts with a Constitution that begins, "We the People..."
That is why the left has for more than a century been trying to get the Constitution's limitations on government loosened or evaded by judges' new interpretations, based on notions of "a living Constitution" that will take decisions out of the hands of "We the People," and transfer those decisions to our betters.
The self-flattery of the vision of the left also gives its true believers a huge ego stake in that vision, which means that mere facts are unlikely to make them reconsider, regardless of what evidence piles up against the vision of the left, and regardless of its disastrous consequences.
Only our own awareness of the huge stakes involved can save us from the rampaging presumptions of our betters, whether they are called socialists or fascists. So long as we buy their heady rhetoric, we are selling our birthright of freedom.