They regard the longstanding conservative temperament of scepticism, caution, and deference to tradition as a gift to a left that wants to cancel, incarcerate or kill them; trans their children; suppress their religion; and change their country irreversibly through mass immigration. They want liberalism gutted in favour of authoritarian nationalism. Politically, they are poles apart, but there is a common theme to the respective establishments they believe themselves to be ranged against: Jews. Zohran Mamdani, the democratic socialist on the cusp of becoming mayor of New York City, is the new face of American progressivism. He famously called for the...