child labour in the cocoa industry:
http://www.antislavery.org/homepage/antislavery/childlabour. htm
Also theres this one http://www.foodnavigator.com/news/news-ng.asp?id=41248-briti sh-cocoa-industry
I read somewhere that Nestle are bad with this sort of thing, but in the coffee industry where they pay a pittance to the workers.