The paranoid style in American politics is back

While clearly on the fringes of politics, the so called alt-right — white nationalists and hard-line opponents of immigration who oppose multiculturalism and defend a particular vision of Western values — has become an influential force in politics.

Since the start of the Trump campaign, alt-right groups have been attracting members and they have strengthened their ties to the Republican Party.

Trump “has sparked an insurgency, and I don’t think it’s going to go away,” Don Black, a founder of the white nationalist website Stormfront, told Politico in December…