The British-based grocery chain Tesco has halted production at a factory in China after a British newspaper said the factory used forced labor to produce charity Christmas cards.The huge grocery chain said it had stopped production and launched an immediate investigation after raised questions about the factory’s labor practices. six-year-old girl in south London found a message inside a box of charity cards that read “we are foreign prisoners in Shanghai Qinqpu prison China forced to work against our will.