I became aware of the John Birch Society almost sixty years ago when, as a child in Norwalk, Connecticut, I saw the conspiracy-obsessed organization participate in a 4th of July parade. There was a Bircher chapter in nearby Bridgeport, as mentioned in this NPR report.
NONE of the crazy assertions made by the John Birch Society came to pass. A rational person would eventually realize they’re on the wrong side of reality, but fanatics aren’t rational.