Revilo P. Oliver, who was a prominent member of the JBS at one point, was openly anti-Semitic. He was forced out for the comment he made after John F. Kennedy's death, something to the effect that the Communists got rid of him once they no longer had a use for him. At least I think that was the gist of it.
Your comment is not accurate. Oliver resigned on July 31, 1966 as a consequence of a speech he made before the annual New England Rally for God, Family and Country-—which was widely interpreted as anti-semitic in tone and substance.
Robert Welch traveled to Oliver’s home to ask him to reconsider his resignation but Oliver did not withdraw it. Oliver then started writing for neo-nazi and white nationalist publications.