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?
Hate to break this to you, but corporations already have no rights. They have privileges. The difference betwen the two is fundamental.
And your phrase, "working in concert," is also fundamental. Two people each have the right of free speech. But if they want to form a legal fiction called a corporation in order to escape liabilities for their joint actions, there is no way to do that. It's impossible. They are still two people who are responsible for their individual actions, working together or not, speaking in agreement, or not.
Oops, that's not true. Look, here;s the government swooping inm telling them that hey, all you have to do is pay us money, and let us tax you, and surrender your human rights, and we'll call you a corporation. That's a fake legal person, with no rights, created by government, answerable to government, owned by government as an individual profit center of the government. From then on, you become a de facto employee of the government, working (in whatever work you do) to generate tax income for the government. In return, according to the tax laws, the government will allow you to keep a portion of the 100% taxable income it can legally require of you at any time, and penalize you at any time for whatever it wants, with the legal understanding that the purpose of your privileges is the government's benefits - not yours.
Now, do you see anything at all about "rights" in that absolutely exact legal description of a corporation? No? Well you're wrong! That's right, you're wrong, because the government has declared that corporate privileges can be referred to as "rights," not in the sense of human rights or the Bill of Rights," but in the sense of a shortening of the full phrase "corporate rights," which are defined as a phrase which refers to the limited operational set of privileges accorded to corporations by the government, in the interests of the government.
There's your "rights."