Antisemitism is unique among religious hatreds. It is a racist conspiracy theory fashioned for the needs of messianic and brutal rulers, as dictators from the Tsars to the Islamists via the Nazis have shown. Many other alleged religious 'hatreds' are not hatreds in the true sense. If I criticise Islamic, Orthodox Jewish or Catholic attitudes towards women, for instance, and I'm accused of being a bigot, I shrug and say it is not bigoted to oppose bigotry.

London is one of the world's centres of Arab journalism and political activism. The failure of left and right, the establishment and its opposition, to mount principled arguments against clerical reaction has had global ramifications. Ideas minted in Britain – the notion that it is bigoted to oppose bigotry; 'Islamophobic' to oppose clerics whose first desire is to oppress Muslims – swirl out through the press and the net to lands where they can do real harm.

No one is as murderously 'Islamophobic' as Islamists are.

In Britain today friends of mine live like dissidents in a dictatorship. They meet in secret. They vet new arrivals to ensure they are not spies. They are ex-Muslims living in a supposedly free country who fear their enemies will damn them as apostates and kill them. How extraordinary that they must hide their true beliefs from all but intimate friends for fear of the consequences. And how shameful that they have no anti-fascist Left worthy of the name to defend them.