For starters you can do what others suggested: don't buy products produced by this kind of labour. Then, you might take the time to ponder the causes of such things happening in the first place. I'll give a hint: it's capitalism, and the reason you don't see exploitation to such an extent in the West is because of the (very bloody) struggles workers waged here during the past two centuries. Then it's up to you what to do with that realization.