Case Note, Agriculture-Section 8c(5)(G) of the Agricultural Marketing Agreement Act Prohibits Federal Milk Marketing Orders from Requiring Compensatory Payments That Constitute Trade Barriers [Lehigh Valey Co-op. Farmers, Inc. v. U.S., 82 S. Ct. 1168], 111 UNIV. PENNSYLVANIA L. REV. 497-515 (1963).