There’s been a clarification on the question I answered yesterday:

OK, now I get it, thank you. Yes, there’s a large amount of literature that’s downright political messaging with no additional value. Think poetry by Amanda Gorman. It’s bad, there’s not a spark of talent in it but she gets promoted because it’s politically useful.
In what concerns novels, I want to mention The Deluge by Stephen Markley. He is the author of one of the best novels of American literature of this century, Ohio (2018). I had high hopes for him but then he went full-on propagandist and came up with the unreadable The Deluge. Such a waste of great talent.
Joyce Maynard, who was quite talented in her younger years, also has gone psycho propagandist in the past decade. I can’t even read the garbage she has been churning out.
Overall, just grab the list of the Oprah Book Club, and you’ll see the emanation of the leftist spirit on full view.
Some of these may qualify as actual literature (partially a matter of opinion I suppose), but are still quite overt:
For Whom the Bell Tolls (Hemingway)
anything by Steinbeck, according to you
The Jungle (Upton Sinclair)
Looking Backward (Edward Bellamy)
Faces at the Bottom of the Well (Derrick Bell)-a book of critical race short stories by the OG critical race theorist. Historically important but I imagine they’re terrible.
Howl (Ginsburg)-opening line is powerful but it’s all downhill from there. Hate this stupid poem. The Beats in general are probably something to look at.
I don’t know enough about other country’s literature or history to suggest books to our question asker but this is a solid list for America I think, including both the classic socialist left and the even dumber left that came after it.
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Theodore Dreiser was a socialist. And a great writer. But he was the kind of socialist who’d die on the spot if he could see today’s “democratic socialists”.
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