Those whose minds never consider their fellow traveller are not bad but disabled, Mr Baron-Cohen argues.

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An old friend and fellow traveller, veteran correspondent Marie Colvin, and young French photojournalist Remi Ochlik were dead.

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In September 2012, passengers aboard a flight from Chicago to Orange County reportedly tackled and restrained a fellow traveller with their belts.

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But the advent of New Labour transformed Diane Abbott from being a youthful radical in opposition to an often uncomfortable fellow-traveller.

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Mr Podhoretz parted ideological company with them as he gradually metamorphosed from a left-winger into a cold-war warrior and Reaganite fellow-traveller, and he cannot now forgive them for failing to follow where he led.

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