So a mine exists and a bunch of heirs have a corporation. Through the corporation, a portion of the wealth miners create by mining from that mine goes to the heirs. The workers doing all the work and creating all the wealth organize and strike a deal that the company hires only union members.

So the thing which is "unethical, immoral, and unconstitutional and violates a person's right to self-determination and other human rights" is not what the heirs did, but what the workers doing all the work and creating all the wealth did. No questions about the province of the heirs. You're dealing with both these groups but questioning the paternity of only one of them, the ones actually doing all the work and creating all the wealth.