Unions in the US also have government restrictions on what they can do. As one example, the Taft–Hartley Act prohibits a number of union actions, restricts First Amendment rights (eg, union offers must sign non-communist affidavits), and expressly allows a company to fire supervisors which support union rights.
The title of this essay uses "Wage Slave." The point is that "maximizing value" is not necessarily aligned with human rights. Is it your view that those two principles never be out of alignment, and if not, what happens in that case?