What happened to Sen. Tom Cotton at the New York Times and Twitter signals serious danger for conservative and other dissenting views in the United States. And it is just one example among many.

The Left’s control of almost all the major outlets for opinion in this country — major newspapers and magazines, television, Hollywood, social media, and university faculties, among others — is a familiar phenomenon. But in the past, popular support for the constitutional guarantee of free expression under the First Amendment (even among liberals) was always a protection for the dissemination of conservative and other alternative ideas.