More than 200 religious organisations, labour, consumer, environmental, and human rights groups are calling on confectionery giant M&M/Mars to ensure fair labour practices for cocoa workers. Coming as M&Ms announces the new colour for its candies after a large promotional campaign, a letter sent to M&M/Mars headquarters by the broad based coalition reads: "Surely, most of your customers would be outraged to learn that the sweetness of their favourite chocolate is tainted with the bitterness of slavery and worker exploitation.