The ranchers have gained support from attorneys general in 11 states - Colorado, Kansas, Idaho, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wyoming.
The lawsuit is filed against JBS Foods, Tyson Foods, Cargill Meat Solutions and National Beef Packing Company, claiming they wrongly labeled imported beef as domestic.
The U.S. District Court of South Dakota sided with the ranchers, but the companies have appealed and that appeal will be held at the 8th U.S. Circuit Court of Appeals.