So if two natural human persons operate in concert (by forming a corporation) they should lose their protections under the constitution?
Each person has the right of free speech, but combined they lose their right of free speech? So a newspaper (presumed to be owned by a corporation) is not protected by the first amendment?
Now I might agree that an organization which extracts payment from a more or less captive segment of the population (read Labor Union) does not enjoy the same right of free speech as say the owners of the corporation and by extension the corporation itself.
Willing to go that far?