Max Blumenthal was utterly flabbergasted when he came to London to speak at an event involving the newly elected Labour leader Mr Corbyn in 2015, and was accused by someone he said was "a gentile"---possibly the egregious Joan Ryan---of being an "anti-Semite."
Blumenthal went up to the Labour Party organizers and told them he wished to refute the smear. He was told it was better to ignore and let things blow over.