But let’s not pretend that clarity about past horrors, if even possible in our Left-dominated education system, would break the spell of Jeremy Corbyn who, despite his socialism, is widely seen by the young as just another social democrat. What would?

The obvious answer is addressing sources of disillusionment with capitalism. But equally important is to expand the ground of the battle. Communism’s immorality is not that it is less capable of improving living standards than capitalism, but that it is prepared to sacrifice personal freedom in the attempt. This is the immorality of today’s Left, too, and why we should reject statism even it could make the economy both bigger and “fairer”.

By many metrics, today’s young are one of the most liberty-loving generations ever. They don’t want to be cogs in a state machine. Thanks to the internet, however, it has been easy not to notice that successive increases in the power of the state have already come at the expense of freedom. It is less obvious your choices are being controlled when you can make them ever more quickly and easily.

The challenge for the Right is to make it obvious. For the alternative would be catastrophic: a repeat of the Red Plenty experiment, by a government run by real Marxists.