The four largest US meatpackers have been accused of knowingly submitting misleading beef price data to the USDA. A class action lawsuit has been filed against Tyson Foods, Cargill's meat division Excel Corp, ConAgra Foods' beef company and Farmland Industries, claiming the companies manipulated the price of live cattle for over a month by submitting falsified reports of daily purchase prices. The alleged actions of the groups could have cost ranchers millions of dollars.