The JBS is usually characterized as a “radical anti-communist organization,” at least by liberal and mainstream media, but that is really only the tip of their nutberg.
I have a copy of a 1960s book called The Hidden Hand (not to be confused with Daniel Pipe’s more recent book of the same title). At the time, The Hidden Hand was practically the Bible of JBS conspiracism. It centered on monetary conspiracy theories, particularly involving the Federal Reserve. However, it treated the FR as only the latest manifestation of a unified conspiracy that it traced all the way back to the 18th century and the first Rothschilds. This financial conspiracy, in turn, is merely the chosen tactic of the real conspiracy, whose objective is to destroy Christianity and Christian civilization. Jewish villains of one kind or another abound in this account and there are strong antisemitic overtones elsewhere.
Much of its take on history and monetary policy would be familiar from the recent writings and speeches of Pat Buchanan, though Buchanan does not claim an overt conspiracy as the cause.