IMO, the JBS are controlled opposition: they mix truth with lies, and people naively think they are 'conservatives' whose aim is to get back to 'Constitutional' government. They are not an organization for true Catholics to be involved with. And I would suspect, extrapolating from my own limited experience, that there are many people in traditional chapels who are being led down the river road by them.
Specifically, (1) their founder Robert Welch always denied that the conspiracy they talk about was in any sense a Jewish conspiracy; (2) they know what side their bread is buttered on and are highly pro-Zionist, completely minimizing the threat from that quarter. They even made apologies and cried crocodile tears for poor Jonathan Pollard, wasting away in prison merely for having spied for our ally Israel; (3) they are always talking Ludwig von Mises/Austrian school economics, which is the delight of the filthy rich corporate CEOs, the Rockefellers, the Rothschilds -- and not at all congruent with Catholic social justice.