You're moving the goal posts.
I didn't say that employers are more powerful by law than employees.
But they are more powerful simply due to the fact that they are bigger and more powerful than any (prospective) employee, they are better organized (employees aren't, unless they're member of a union) through amongst others the Chambers of Commerce. So principally they are able to demand an employee to work for a ridiculously low wage in order to be employed, and the single employee can't do anything against that, because there's always some poor desperate guy that feels forced to accept the terms. But if the employees are (also) organized, in a union, there's more balance of power.