In oral arguments Wednesday, the Supreme Court will hear the government defend its kleptocratic behavior while administering an indefensible law. The Agricultural Marketing Agreement Act of 1937 is among the measures by which New Dealers tried and failed to regulate and mandate America back to prosperity. Seventy-eight years later, it is the government’s reason for stealing Marvin and Laura Horne’s raisins. New Dealers had bushels of theories, including this: In an economic depression, prices fall, so a recovery will occur when government compels prices to stabilize above where a free market would put them. So Franklin Delano Roosevelt’s “brains trust”...