The Chief Rabbi is a politician now, of his own choosing, he's made a number of outrageous, unsubstantiated claims and smeared a party that has over 500,000 members.
Given this, it is a testimony to just how unfounded his bullshit is, that he has received so little blowback, then again he knew this in advance of his article. If the Labour party was what he claims it is, his words would have placed the Jewish community in a difficult position, the fact that it hasn't, is the truth that dare not speak its name.
Jeremy Corbyn is not anti-Semitic, the Labour party is not anti-Semitic, it does not have a history of anti-Semitism and it does not have any anti-Semitic policies, it does however have a policy of supporting a Palestinian homeland.
The Chief Rabbi knows all this..... and then he played his hand.