Excerpt from article: 

...Ivory Coast is the world's largest producer of cocoa beans. Its 600,000 farms provide about 40 percent of the worldwide supply.

Bama Athreya, deputy director of the International Labor Rights Fund and a Global Exchange board member, said the Mali children were brought to Ivory Coast under false pretenses, were not paid and couldn't leave... 

Athreya said it would be "extremely unusual" if Hershey were not using one or all three of these companies as suppliers...