You are obviously equivocating. This type of "right" is not at all the same thing that was raised in the OP by the union.
Again, I think what you mean by "natural rights" which can't be removed (even if they're violated) is a sense of what ought be.
As someone else said, that's what is part of human nature. (Although even that part is debatable, unless you think human nature changed drastically just a few hundred years ago.)
At any rate, clearly what the union was talking about was recognition by society (indeed, legally) of new "rights".
Equivocation is when you use an ambiguous word as if it weren't ambiguous.
Clearly, what the union meant by "rights" and what you mean by "natural rights" are not the same thing at all.