(Certiorari, ante, p. 813, to the United States Court of Appeals for the Seventh Circuit.) The. motion of American Farm Bureau Federation for leave to file a brief, as amicus curiae, is granted. The motion of National Livestock Feeders Association et al. for leave to file a brief, as amici curiae, is granted. The motion of the National Independent Meat Packers Association for leave to file a brief, as amicus curiaé, is granted.