Cavendish Farms, Lamb Weston, McCain Foods and the J.R. Simplot Company, the four leading producers and sellers in the United States of frozen potato products like french fries, hash browns and Tater Tots, conspired to artificially fix the prices of their spuds by sharing trade information and coordinating price raises beginning in 2021, according to the antitrust lawsuits filed in the U.S. District Court for the Northern District of Illinois within the past week.