A labour rights group has accused major U.S. companies of selling toys made in China by badly paid workers who it says are exposed to dangerous toxins, but an industry association denied the charge. About 100 people organised by the National Labor Committee for Human Rights demonstrated outside the annual Toy Industry Association convention in New York, accusing Hasbro, Mattel/Fisher-Price, Toys 'R' Us and Wal-Mart of violating China's labour laws and international standards.