But then they'll tell you that these employees are very happy to work at such factories, because they make way more money than they would ever make on the farm in their hometown, and often work there a year or two to save as much money as they can before moving back to where they lived before.
(Apple actually does way better than most other companies on that front - see http://www.apple.com/supplier-responsibility/)
Does it open an entire rabbit hole about the ethics of globalization? Sure. Is it a strictly black and white issue? ...heh.
I'd presume that they do absent a credible source they don't.
Also, they colluded with other companies to, effectively, keep employees' wages down. Amount of money they saved was probably a rounding error for them in this case too.