Our previous discussion touched upon the immediate context of Franklin D. Roosevelt’s “court-packing plan” in February 1937. Now, let us delve into the profound and lasting consequences of that pivotal moment: the dramatic reinterpretation of the Commerce Clause of the U.S. Constitution and the subsequent massive expansion of federal police powers. This is a story of how a shift in judicial philosophy fundamentally reshaped American governance.
Before 1937, the Supreme Court held a remarkably narrow view of Congress’s power under the Commerce Clause. This era, stretching from the 1890s, was characterized by a commitment to “dual federalism,” which essentially asserted that certain activities were exclusively within the domain of state power, and the federal government could not intrude. The Court rigidly distinguished between “commerce”—understood as traffic or exchange—and other stages of business, such as manufacturing, mining, or agriculture. For instance, in U.S. v. E. C. Knight Co. (1895), the Court ruled that a sugar refining monopoly was a matter of manufacturing, not commerce, and thus beyond federal regulation under the Sherman Act. Similarly, Carter v. Carter Coal Co. (1936) declared the Bituminous Coal Conservation Act unconstitutional, emphasizing that coal mining was a local activity, regardless of its ultimate effect on the national economy. The Court often used the Tenth Amendment as an “independent constraint” on congressional authority during this period, fiercely protecting what it saw as states’ prerogatives. This approach meant that Congress could only regulate activities with a direct effect on interstate commerce, a distinction deemed “essential to the maintenance of our constitutional system”. Landmark New Deal programs like the National Recovery Administration (NRA) were struck down, with the Court asserting that even if poultry originated out-of-state, once it reached local slaughterhouses, “interstate commerce had ended,” and the business became intrastate, thus escaping federal reach. The Agricultural Adjustment Act (AAA), which aimed to regulate agricultural production and impose taxes, was also invalidated on the grounds that agriculture was a local matter, outside Congress’s enumerated powers. As one justice lamented, if the Commerce Clause were construed too broadly, it would “reduce them [states] to little more than geographic subdivisions of the national domain”. Indeed, some argued that the Court in this era was actively invalidating federal and state laws at an unprecedented rate, prioritizing “freedom of contract” under substantive due process.
The period after 1937 witnessed nothing short of a “constitutional revolution,” described by Edward Corwin as “so radical, so swift, so altogether dramatic”. While Roosevelt’s “court-packing” plan itself did not pass, its introduction served as a powerful catalyst for change within the Supreme Court. What has famously been dubbed “the switch in time that saved nine” occurred when Justice Owen Roberts, who had previously sided with the conservative majority, began voting with the liberal minority in cases challenging New Deal legislation. This shift began with West Coast Hotel Co. v. Parrish (1937), which upheld a state minimum wage law, overturning a decision from just months earlier. This was quickly followed by decisions upholding the National Labor Relations Act (Wagner Act) in NLRB v. Jones & Laughlin Steel Corp. (1937) and the Social Security Act in Chas. C. Steward Mach. Co. v. Davis (1937). The Court, in these cases, moved away from the narrow “direct vs. indirect effects” test, recognizing that “activities, however intrastate in character when separately considered, if they have such a close and substantial relation to interstate commerce that their control is essential or appropriate to protect that commerce from burdens and obstructions, Congress cannot be denied the power to exercise that control”.
This profound change continued with United States v. Darby (1941) and Wickard v. Filburn (1942), which effectively “overruled the earlier era of decisions and expansively defined the scope of Congress’s commerce power”. The Court declared that “commerce includes all stages of business; no longer is a distinction drawn between commerce and other stages of business such as mining, manufacturing, and agriculture”. Furthermore, the Tenth Amendment was largely discarded as a limit on Congress’s Commerce Clause power. From 1937 until 1995, it became exceedingly rare for a federal law to be invalidated as exceeding the scope of Congress’s commerce power.
This expansive reinterpretation of the Commerce Clause became the primary constitutional basis for an unprecedented surge in federal legislative activity and the concomitant expansion of federal police powers across a broad spectrum of areas:
- Civil Rights Legislation: The Commerce Clause was wielded as a powerful tool to outlaw racial discrimination. For instance, the Civil Rights Act of 1964, a monumental piece of legislation, was upheld under the Commerce Clause. The Supreme Court, in cases like Heart of Atlanta Motel, Inc. v. United States and Katzenbach v. McClung, Sr. & McClung, Jr., reasoned that racial discrimination by motels and restaurants serving travelers burdened interstate commerce, regardless of how local their operations might appear. This enabled federal intervention in spheres previously untouched by national law, asserting that such discrimination “imposed burdens both upon the interstate flow of food and upon that commerce”.
- Regulatory State: The New Deal era itself saw an “explosive” growth of federal government and administrative agencies, which became “integral to modern governance”. This included new policy experiments like the AAA and the NIRA (though the NIRA was struck down on other grounds). The technocratic knowledge regime that emerged in the early 20th century, particularly from the 1920s through the 1970s, facilitated this expansion, with the federal government entering diverse areas such as antitrust, agriculture, transportation, communication, and food safety. This regulatory apparatus aimed to stabilize the economy and, in some cases, provide relief to the lower classes.
- Criminal Law Enforcement: The Commerce Clause also became the basis for federalizing criminal law, allowing Congress to regulate purely intrastate activities if they substantially affected interstate commerce. A key example is Perez v. United States (1971), where the Court upheld the Consumer Credit Protection Act, which targeted “loan sharks,” reasoning that extortionate credit transactions, even if intrastate, could affect interstate commerce. This principle allowed the federal government to reach into areas traditionally governed by state police powers.
- Drug Enforcement: Historically, drug enforcement was largely a local and state responsibility. However, with the expansive Commerce Clause interpretation, federal control over narcotics grew significantly. The Marihuana Tax Act of 1937, for example, imposed a high-cost transfer tax stamp, effectively banning marijuana at the federal level, with states soon following suit. Later, when this tax act was struck down in 1969, the prohibition of cannabis was “fully organized under the Commerce Clause,” which by then had become central to national policy due to the New Deal reforms. Even today, the Commerce Clause continues to justify federal cannabis prohibition. This illustrates how the federal government increasingly used its expanded Commerce Clause authority to dictate morality and social policy across the nation, effectively transforming what were once local police powers into federal concerns.
While the Court, since the 1990s, has shown some tendency to narrow the Commerce Clause power (e.g., United States v. Lopez and United States v. Morrison) and revive the Tenth Amendment as a limit on federal action, the overall framework established in the post-1937 era remains largely intact. Even in cases where the Court has restricted Congress’s reach, such as the regulation of gun possession near schools in Lopez, it still acknowledged the three broad categories of activity Congress may regulate under the Commerce Clause, including activities substantially affecting interstate commerce. In Gonzales v. Raich (2005), the Court reaffirmed Congress’s power to regulate purely local activities (like home-grown marijuana for medicinal use) if they are part of an economic “class of activities” that, in the aggregate, have a substantial effect on interstate commerce.
Thus, the 1937 reinterpretation of the Commerce Clause, instigated by the political pressure of Roosevelt’s court plan, fundamentally altered the constitutional landscape. It transformed what was once a limited grant of power into a sweeping authority that has since permitted the federal government to regulate an immense array of economic and social activities, including those traditionally considered within the sphere of state police powers. This redefinition allowed the federal government to pursue a unified “national” approach to problems, shifting the balance of power decisively towards Washington and laying the groundwork for the expansive federal state we recognize today.