Aurora Organic Dairy, the largest private-label producer of "organic" milk in the U.S., has sent legal threats to sue the Cornucopia Institute, Organic Consumers Association and the Center for Food Safety. The letters demand that the public interest groups retract statements they made about Aurora's federal violations of organic food production and labeling laws as well as refrain from suing Aurora for consumer fraud. "The most serious finding, resulting from the USDA investigation, was that Aurora sold, labeled, and represented milk as organic when in fact it was not, in 'willful violation' of the law."