You are right in your assessment that antisemitism in this instance is a trope being used to mask other issues, Robo, but I will have to disagree on what it is being used to mask. The brexiteers do not care about racism. They want to be rid of foreigners anyway. The establishment however are running scared of the rise of the left wing. The attacks on Corbyn and any of his allies are to try and remove his popular support. It is not working and will, hopefully, continue to backfire as it did in the last election.