https://www.americanthinker.com/articles/2018/07/the_old_versus_the_new_left.html
When it comes to being anti-American, the left’s current incarnation is certainly no slouch compared to its older Marxist namesake
Politics often evolves in strange, unpredictable ways. For example, what white Southern Democrat in 1960 would have foreseen that within forty years, the South would be solidly Republican? And that black voters would help elect a black Democrat as president?
An even more extreme transformation has been the American left. In a nutshell, if a leftist from the 1930s were transported to the present via a time machine, he would not only fail to recognize today’s left, but would denounce it as a fraud, the antithesis of its historic mission and a traitor to the working class. If this time-traveler were to return to the 1930s and recount what he had observed, nobody would believe him. Surely, he would be told, the left could not have evolved into such a perversion of its historic mission, and this ludicrous time machine tale is just a cover-up for a week of binge-drinking.
To understand the left’s bizarre transformation, begin with Marxism’s central principle: the centrality of class – namely, the idea that the division between those owning the means of production (the capitalists) and all others explains everything from politics to art and science. Moreover, it is the responsibility of the left (i.e., the Communist Party) to keep class central and thus advance interests of workers (sometimes called the proletariat). To be sure, political necessity periodically counsels promoting a non-class agenda (recall the U.S. Communist Party’s foray into the 1931 racially charged Scottsboro Boys case), but these are temporary tactics and are always ultimately subordinated to advancing class interests. Promoting policies based on religion, ethnicity, sex, geography, race, and all else thus makes for counterproductive distractions.