I visited a JBS bookstore as a kid, and I was familiar with their message. They were absolutely over the top, the Lyndon Larouche of their day. Everyone was a communist, especially Eisenhower, and they had a map showing the old south had been promised to the blacks as a separate country called the “Union of Soviet Socialist Negro Republics” or USSNR.
I swear the guy working the store looked and sounded like Lee Harvey Oswald. (It wasn’t).
The assassination of JFK was one of the few big events that was purely communist engineered. Solely by the one guy, Oswald, who was personally a communist, though it’s not clear he did it for that reason in particular. Funny enough, JFK conspiracy theorists, who are sufficiently loopy to leave Birchers in the dust, Oswald’s acting alone on the advice of his own ideologically addled mind is the one theory they won’t pursue.