Before that it was John Birch Society spreading out magazines and having meetings in homes like Avon. I do agree the internet, mainstream radio, and TV helped a lot too. Cutting down access to not yet radicalized people I do think would help. People used to think birchers were crazy, even on the right. Up until they basically transformed into the Tea Party. (Funded a lot by Kochs, sons of one of the original Birchers).