This would be an interesting law school exam question :) Is there a de minimus ownership that triggers a shareholders right to be present? Were slave owners permitted to mount a defense on behalf of their accused slaves?
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And this discussion demonstrates the absurdity of corporations = people.
If you prick it, does it bleed? If you tickle it, does it laugh? If you poison it, does it die?
So, this point bugs me. I am dead set against the decision to allow corporations to participate in our political system but nobody has ever said "So, mom, dad... this is Purdue Pharma - you can call him Fred for short - we're uh, we're getting married!". Corporations aren't people, they aren't human beings and they aren't homo-sapiens what they are is, quite accurately, legal "persons" when it comes to how a lot of US laws are worded.
There are things that you do and a corporation do that a river can't do, and to describe this set of things laws use the term "person" this makes sense but the name is terrible. In the US, for instance, you can't sue a mountain if you fall and hurt yourself - you can sue a mining company that left equipment there, or maybe the national parks service for having unsafe trails or maybe even your friend Fred (i.e. Purdue Pharma) for pushing you off the edge of the cliff (maybe, more accurately, for failing to inform you of a dizziness side effect in a medication they sold you that caused you to fall) but you can't sue the mountain itself and, likewise, there is no way a mountain could be punished that we can comprehend - again, maybe if this mountain is owned by someone then, as a result of this suit, you are awarded partial mining rights or ownership of the mountain - but that is a compensation granted at the loss of some other entity, maybe a mining company, or the property owner or even the US government.
Either way, corporations and human beings have some legal commonalities that aren't shared with mountains.
elliekelly as you're actually a lawyer, can you express this better or clarify it?
I think what you're getting at is the distinction between "persons" and "natural persons." Typically when a law applies to "persons" (sometimes it will say "legal persons") it applies to both corporations and humans for the reasons you've mentioned above - we need to be able to sue them, tax them, regulate them, etc. And when a law applies to "natural persons" it's intended to apply only to humans which is why, as much as you might love Amazon, you can't marry it. (So far no legal terminology to distinguish mountains that I'm aware of... )
To your point, corporations have always had "rights." The government can't just show up to your house and take your property without due process and, because corporations are "legal persons," the government can't just show up to company headquarters and take corporate property either. Corporations need some of the legal rights we grant to natural persons or else the corporate entity is pointless. But corporations also can't have the same rights as natural persons or else every stock broker is also a slave trader.
The reason the Citizens United ruling was such a big deal was because the court extended first amendment rights to corporations when those rights had historically only been given to natural persons. If you get a chance you should read the opinion because the rationale seems much more reasonable on paper than it is in practice. Contrary to public opinion, the court didn't rule that "corporations are people" (technically they always were) but rather that corporations are associations of natural persons and since natural persons can form associations to exercise their first amendment rights then they can form corporations to exercise their first amendment rights.
But for an entity whose purpose is to exist somewhere between human (definitely a person) and mountain (definitely not a person) it doesn't make sense to extend all of the rights of personhood to that entity just as it doesn't make sense to treat the entity the same way we treat a mountain. Lawyers can form associations to practice law but we certainly wouldn't allow a group to incorporate and have the entity sit for the bar exam... right? Citizens United certainly muddied the water in where the law draws that line.
Post your question on r/legaladviceofftopic I bet you'll get some very interesting answers...