Want to give these libs some theory to read but think they'll be scared off by Marx and Lenin? Anything a bit more SocDem friendly that gets the basic points across - class consciousness, why they need to organise and how etc.?
Shoer articles preferred but anything will do tbh
Not a book but a channel like Second Thought might help. It's friendly and easy enough to understand without diving deep into communist theory. It's a start.
Seconding Second Thought, also adding First Thought!
This series by Jacobin is IMHO a really good primer into leftism for libs: https://www.youtube.com/watch?v=BDg71ql7zQs&list=PLxlNhP2f0kULW8hdxvfF6ZcDbndpvF8Sb
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: