Biel Crystal Manufactory Ltd, a Hong-Kong based company that makes screens for Apple Inc, is violating workers' rights at its Chinese factories, a Hong Kong rights group alleged in a report. The Students & Scholars Against Corporate Misbehaviour (SACOM) report said Biel Crystal, which makes iPhone screens, requires its employees to work 11-hour shifts, seven days a week, with only one day off each month. Employees are also often injured and not given reasonable compensation and have to sign blank contracts, the report said. At least five workers at the firm's Guangdong factory in mainland China committed suicide since 2011, it added. There was no immediate comment from Biel Crystal on the report. Kitty Potter, a spokeswoman for Apple in Greater China, said that the U.S. company "investigates such cases." "We insist that our suppliers provide safe working conditions, treat workers with dignity and respect, and use environmentally respo...