And so it soon proved.
Anti-Israel Labour ferals including as-a-Jews demostrate (a MrAlexSeymour video); sorry, the video insists on aligning itself to the right! (What fun to see the ferals this furious!)
More, insisting on staying left this time:
Full marks for integrity, by the way, to the BBC's technology correspondent Rory Cellan-Jones.
In 2007 he campaigned against the National Union of Journalists pro-BDS initiative, and here he is again, challenging the NUJ to state where it stands on antisemitism: