Harlan F. Stone,
United States v. Wrightwood Dairy Company Wrightwood Dairy Company…
“ We conclude that the national power to regulate the price of milk moving interstate into the Chicago, Illinois, marketing area, extends to such control over intrastate transactions there as is necessary and appropriate to make the regulation of the interstate commerce effective; and that it includes authority to make like regulations for the marketing of intrastate milk whose sale and competition with the interstate milk affects its price structure so as in turn to affect adversely the Congressional regulation. ”
