The non-delegation doctrine is a principle in administrative law that Congress cannot delegate its legislative powers to other entities. This prohibition typically involves Congress delegating its powers to administrative agencies or to private organizations.
In J.W. Hampton v. United States, 276 U.S. 394 (1928), the Supreme Court clarified that when Congress does give an agency the ability to regulate, Congress must give the agencies an "intelligible principle” on which to base their regulations. This standard is viewed as quite lenient, and has rarely, if ever, been used to strike down legislation.
In A.L.A. Schechter Poultry Corp. v. United States, 295 U.S. 495 (1935), the Supreme Court held that "Congress is not permitted to abdicate or to transfer to others the essential legislative functions with which it is thus vested."