There wasn't? I remember going through the catalogs in the public library as a kid, looking at the microfilm, even listening to some audio recordings. Even a public library had loads of information, and the thought of it being made inaccessible on an arbitrary whim was unthinkable. Sure, it's not comparable to the reach of today's instant broadcast via Internet, but it was the equivalent of the time.
Maybe in the time of Jim Crow or something certain public libraries would censor this stuff. I honestly don't know. It just seems to not jibe with my experience as a kid getting information at the library.