They prefer the term "progressives" but the correct term is simply "leftist" or "socialist."
Now American conservatives, who are indeed "classical liberals", aren't really on "the Right" in the original European sense of the term.
Progressive isn’t a right/left designation.
Teddy Roosevelt was a “right progressive” who talked tough on things like border control but supported eugenics, seized land for the feds by the millions of acres, and targeted business with higher taxes.
Utopians could be another term to describe leftists and liberals. That describes people who cannot see or face reality. They strive for something that is impossible....a perfect world.
Since man is imperfect and can never be perfect, a perfect world on earth can never be realized.
Now the past is a known quantity, it tells us what humans are, how the behave, and what is possible.
The future is an unknown quantity, accessed only by an old gypsy woman with a crystal ball