Believing that there is a global conspiracy of bankers, Zionist colonialists, and the freemasons to oppress the workers of the world is a dangerously bonkers idea. And it is also bound to attract and sustain antisemites. The man who painted Corbyn's mural is just one example.
Jeremy Corbyn wasn't on those Facebook groups of antisemites by accident, nor did the mad conspiracy mural come to his attention by happenstance. He belonged to these groups because he shares their conspiracy-driven way of looking at the world, even if he wouldn't always use the same language.'