The John Birch Society may have changed over the years, but it always used to have many major league Jew-haters in its membership.
Officially, its purpose is to oppose Communism.
They earned the reputation as a lunatic-fringe group who saw Communists under every bed...the kind of folks who in the 50's led "Elvis is a Communist" crusades & in the 60's believed that John, Paul, George, and Ringo were active Communist agents on orders from Moscow.