Should a union be denied freedom of speech? Because a union is a corporation as well. What about the Sierra Club? Should they be silenced? They too are a corporation. Should a teachers union be allowed to speak, but Khan Academy denied the same right? Should organizations advocating free WiFi be allowed speech, but Comcast be denied the same right?
The “companies are not people” tripe being parroted since Citizens United is a naïve and dangerous road down which people are attempting to travel. At the core of the issue is the right of free association. Free association is fundamental to free speech and a free society. Profit motive is irrelevant because profit is just as valid of a goal as “better schools” or “better public policy” or whatever the cause might be.