These companies have a government-approved oligopoly on the public airwaves, and make big money with it. It is not unreasonable to say that first amendment righ

These companies have a government-approved oligopoly on the public airwaves, and make big money with it. It is not unreasonable to say that first amendment rights extend to the public airwaves, even if access happens to be managed by a private corporation. And yes, that would by inference mean that the KKK or NRA could run ads, too. You can't have free speech for only the speech you like.