This grave issue was taken up some US senators and tried amending the child labor laws. However the chocolate industry opposed it tooth and nail. They have even stopped or reduced the funding promised to minimize the child labor and building schools. Lack of funds is killing the projects initiated to protect the children. Giants like Nestle have done little or nothing to assuage the pain of these farmers and children. These companies have failed to meet the deadline ( July 2005) to end child labor abuse.
Check for this logos before buying choco products. It signifies that no child labor or slavery was used in making the product and workers were treated and paid fairly.
It would be worth checking out these sites dedicated to this issue.
Chocolate & Slavery
IRLF Cocoa campaign
Democracy Now , Audio/Video
Global Exchange Campaign for fair Cocoa Trade
Yale Global Online
Fair trade companies for chocolates