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I got so used to Hexbear's pocket universe that I forgot how terrible internet liberals actually are.
(hexbear.net)
I assumed it was just "hire more LGBTQIA+ prison guards!" 
It's worse than that. What I've seen recently because of federation is "(verbal performative) support for disadvantaged people as long as they maintain a successful small business in a disadvantaged area for no less than three years and aren't anywhere to the left of Bernie Sanders!"
๐ท ๐ท 
Got any good places to start?
I think the list can get very long very quickly. Yours is a good one. Engels can be easier to read than Marx and Socialism: Utopian and Scientific is great because it's short and as liberalism hasn't moved much in the 100+ years interim, it's still highly relevant even if the names have changed. Then Parenti is Parenti, what more is there to say, and Losurdo is top notch, too, although I haven't finished his book on liberalism yet.
https://redsails.org/why-marxism/