A human rights group has sued three U.S. companies in federal court in Los Angeles to force them to step up efforts to end child labor on African farms that supply cocoa beans used to make chocolate products. The International Labor Right Fund filed suit on behalf of former child laborers against Nestlé...Archer Daniels Midland Co...and privately held Cargill Inc. on Thursday claiming the companies are involved in trafficking, torture and forced labor of Mali children who were enslaved to work on Ivory Coast farms. Representatives for Archer Daniels Midland...and Cargill...had no comment on the lawsuit. A Nestlé spokeswoman also would not comment on the lawsuit, but said the company was working with the International Cocoa Initiative foundation created by the Harkin-Engel protocol.