Have you ever heard of Foxconn? I had not until a NPR program (This American Life) did a feature on it. It is a Chinese based company with 1.3 million (!) employees. They specialize mostly in outsourced electronics for American and European companies and are the manufacturer of iPads, iPhones, Xbox, Kindle, and more. Their largest facility is in Shenzhen and is a virtual city with 500,00 employees. With most workers housed in crowded dormitories, by far the "city" has the highest population density in the world, more than five times as dense as Mumbai.
As you might expect, there have been accusations of child labor and poor working conditions, but I couldn't really see from what little reading I did that they used sweatshop conditions found with some Indonesian manufacturers. I suppose it is just a part of China's growing pains.
I don't have a huge opinion good or bad about them, but have always thought it is important to know about the source of the products we use. I was amazed I had not ever hear of one of the largest private employers in the world.