Ms. Greene is now playing dumb, to choose a phrase. “I do not know Nick Fuentes,” she said. “I’ve never heard him speak. I’ve never seen a video. I don’t know what his views are, so I’m not aligned with anything that may be controversial.” But in the public mind she is aligned, since she accepted a laudatory introduction from Mr. Fuentes as his special “mystery speaker.”

Here’s what Mr. Fuentes said minutes before she took the stage. “Take a look at everything we’ve put together,” he said. “You want to know the secret? To borrow a phrase from a friend of mine, our secret sauce here, it’s these young, white men. That’s what we call the secret ingredient. America and the world has forgotten about them, but not us.”

He added: “They say about America, they say ‘diversity is our strength,’ you know. And I look at China, and I look at Russia. Can we give a round of applause for Russia?” The crowd cheered and chanted “Putin.” Yes, cheers for Vladimir Putin.