I was mainly thinking at sweat shops at the time, here are some info about this problem.
http://www.globalexchange.org/campaigns/sweatshops/
http://www.behindthelabel.org/pdf/Retailindus.pdf

I did however to my horror find this text when I searched for information about sweat shops.
http://www.thesunmagazine.org/slavery.html

Thease are only simple examples but they do show that there is a problem out there.