Teamsters President Sean O’Brien spoke at Trump’s Republican National Convention on Monday. This was a bad move. Much of the speech would have been fine if he had delivered it somewhere else. O’Brien railed against corporate greed, singling out Amazon and the private equity vultures that killed Yellow Freight. He called for stronger labor laws. Nobody says that stuff at the Republican convention, so some unionists were pleased to hear righteous themes reach a new audience. But it almost didn’t matter what he said—the far louder message was where he said it.