Hundreds of Foxconn workers joined a rally in Zhengzhou, the capital of Henan province, last week (Dec. 12-13) over alleged unpaid bonuses. Workers at the rally claimed they were promised an additional RMB 6,000 (around $870) in cash if they worked 55 days, but local employment agencies reneged on the deal. Some protesters were reportedly detained and beaten by police. Apple supplier Foxconn did not confirm the reports but has said it will look into the matter…