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Panama Refining Co. v. Ryan, 293 U.S. 388 (1935), also known as the Hot Oil case, was a case in which the US Supreme Court ruled that the Franklin Roosevelt administration's prohibition of interstate and foreign trade in petroleum goods produced in excess of state quotas, the "hot oil" orders adopted under the 1933 National Industrial Recovery Act (NIRA), was unconstitutional.

The ruling was the first of several that overturned key elements of the administration's New Deal legislative program. The relevant section 9(c) of the NIRA^[1] was found to be an unconstitutional delegation of legislative power, as it permitted presidential interdiction of trade without defining criteria for the application of the proposed restriction.

The finding thus differed from later rulings that argued that federal government action affecting intrastate production breached the Commerce Clause of the Constitution. In Panama v. Ryan, the Court found that Congress had violated the nondelegation doctrine by vesting the President with legislative powers without clear guidelines and by giving the President enormous and unchecked powers. The omission of congressional guidance on state petroleum production ceilings occasioned the adverse ruling because it allowed the executive to assume the role of the legislature.

Justice Cardozo dissented and claimed that the guidelines had been sufficient.

In 1933, President Franklin D. Roosevelt delegated broad authority to the Secretary of the Interior to enforce § 9(c) of the National Industrial Recovery Act. The Secretary subsequently issued regulations requiring participants in the petroleum industry to report production and transportation activities and to maintain records demonstrating compliance with state production limits.

In August 1933, the President issued an executive order approving the "Code of Fair Competition for the Petroleum Industry" (the Petroleum Code) under Title I of the National Industrial Recovery Act. The code established a system of production quotas for the petroleum industry, with output allocated among the states and then distributed among individual producers. Oil produced in excess of an assigned quota was treated as a violation of the code and subject to federal penalties.

In October 1933, several petroleum companies filed suit, arguing that the regulations and executive orders rested on an unconstitutional delegation of legislative power. A federal district court issued an injunction against enforcement, but the decision was reversed on appeal.

The Panama Refining decision followed the Court's recognition in Nebbia v. New York that the Due Process Clause of the Fourteenth Amendment did not restrict legislatures from enacting price controls and other economic regulations they deemed to be in the public interest. In Panama Refining litigants primarily challenged the statute as an infringement on freedom of contract, with the nondelegation argument presented as an alternate basis for invalidating the statute. After decades of unsuccessful nondelegation challenges to public-utility legislation it became the first case to invalidate a statute on non-delegation grounds, thereby imposing a structural limit on legislative power without reviving the judicial doctrines abandoned in Nebbia.^[2]

The Court first concluded that the challenge to § 4 of Article III of the Petroleum Code rested on a mistaken premise because the provision treating excess production as a punishable violation had been removed by executive order before the case was filed. Although the provision was later reinstated, no live controversy existed when the suit was brought, and the Court therefore declined to address its validity.

Turning to § 9(c) of the National Industrial Recovery Act, the Court held that Congress had delegated legislative power without providing a limiting principle to guide the President's exercise of authority.^[3] Section 9(c) authorized the President to prohibit the interstate transportation of "hot oil" but neither declared such transportation unlawful nor specified the circumstances under which it should be prohibited. Because the statute imposed no standards or factual predicates for executive action, the Court concluded that it conferred essentially unbounded discretion that could not be limited by the Act's broad policy declarations.

The Federal Register Act of 1935 required all documents having "general applicability and legal effect" to be officially published so courts would not issue rulings on superseded regulations as the courts below did in Panama Refining.^[4]

• Connally Hot Oil Act of 1935

• Hart, James (1942). "Limits of Legislative Delegation". Annals of the American Academy of Political and Social Science. 221: 87–100. doi:10.1177/000271624222100114. JSTOR 1023967. S2CID 144182838.
• Larkin, John Day (1937). "The Trade Agreement Act in Court and in Congress". American Political Science Review. 31 (3): 498–507. doi:10.2307/1948168. JSTOR 1948168. S2CID 146981948.

• Text of Panama Refining Co. v. Ryan, 293 U.S. 388 (1935) is available from: Cornell CourtListener Findlaw Google Scholar Justia Library of Congress