Andrew Syrios' piece is an eyeopener. It's titled A Brief History of Progressivism, and in it he provides exactly what the title says.
For anyone who didn't know, Progressives at various times in their history have championed such causes as prohibition, eugenics, and communism. And they've made heroes of such unsavory characters as Fidel Castro and Che Guevara. So it's not a proud history, except to the Progressives who write it and anyone else who can get wooed by a clever use of words. Speaking of their words, here's Syrios:
Progressives have a way with words that is truly impressive. Perhaps it started when they stole the word liberal from libertarians and since has snowballed out of control. From “social justice” to “pro-choice” (except with light bulbs) to various “isms” to describe their opponents, progressives are experts at such linguistic feats. And while conservatives and even libertarians unfortunately use many trite phrases in place of an argument as well, progressives are the all-time champions. The best proof of this is the term progressive and their excessive use of it when referring to everything they support as being progressive and everything they oppose as more or less reactionary. This simple dichotomy is a pleasant fiction for those who like their politics boiled down to the most unsophisticated, partisan blather. However, the idea of progress coming on some gradient between reactionary conservative or libertarian and progressive liberal is blatantly fallacious.
My favorite is the way "Pro-choice" replaced "Pro-abortion." And let's not forget "climate change denier."