They don't have to burn books when nobody reads them.™

https://theanarchistlibrary.org/library/emma-goldman-there-is-no-communism-in-russia
https://theanarchistlibrary.org/library/petr-kropotkin-the-conquest-of-bread
https://theanarchistlibrary.org/library/alexander-berkman-what-is-communist-anarchism

Take a few whiles to look through at least the table of content of those.
You may begin to understand why they say 'that isn't real communism', because it wasn't.

What happened in the ussr and china had nothing to do with working together to make the world a better place for all of us.

I can lead you through the history of the name stealers stealing this name, too.
If you would like to have a better grasp on the reality of what happened back then.