On a related note: If you're a lib looking to educate yourself on what exactly communism is read Principles of Communism, also by Engels. It's literally an FAQ describing the very basics, and a much better starting point than the manifesto which is what most people tend to start off with.
My boy Freddy really knows how to distill these concepts into an incredibly easy to digest form.
I might make some posts going through different bits of introductory theory, since I plan to go back and read through the fundamental stuff again and take notes. With federation being a thing now it's a great opportunity to expose other Lemmy users to theory