I'm going to say this respectfully, but I bet you either weren't born before the '60s, or you weren't old enough to remember it. Here's a link to a WSJ editorial published on the day of William F Buckley's death. It was originally written for Commentary Magazine and was to run a few months later in Commentary. Buckley effectively articulates (per usual) the problems with the Birchers, and his (as well as some others) campaign to marginalize them.
Interesting piece by Buckley. Thanks for posting it. What I got from it, though, is that it was the founder, Welch, who had all the crackpot ideas. Again, I ask (and again, without caring enough to go google it for myself) what does the John Birch Society say today (presumably, Welch no longer being with them or with us) and specifically what do they say that is so egregious that Mark Levin can’t be in the same (big) room with them?
Thank you for that WSJ link. Most enlightening.