His principles? Marx outlined a class-based worldview based in material conditions as a pointer to the path of history.
The leftist freaks of today have given up on class warfare and are going with an unrecognisable mishmash of notions that are absolutely not rooted in anything material whatsoever. The biggest "achiement" of the left in the past thirty years is to push sexuality and "gendered souls" to the forefront of public life and gave the public look on helplessly while "gender clinics" cause irrepairable harm to young bodies of confused teenagers. Every hammer-and-sickle-in-bio type you see spouting communist drivel on Birdsite is an sexually frustrated non-achiever that's waiting on his parents to die so he/she/it can inheret their real estate.
Words are not facts, and losers repeating a century old words of people far more accomplished than they do not make them communists.