The regulation of cannabis in the United States did not begin in a vacuum. By the time the federal government moved to act in the 1930s, individual states had already been enacting restrictions on the sale and use of cannabis sativa for decades, with significant activity beginning as early as 1906. It was against this backdrop of existing but fragmented state-level regulation that a new federal campaign emerged, driven largely by one man's institutional ambition and a convergence of economic and political interests that would shape American drug policy for generations.
Harry J. Anslinger, the head of the Federal Bureau of Narcotics, was the central architect of federal cannabis regulation in this period. Throughout the early 1930s, the FBN reported what Anslinger characterized as an increase in marijuana use among the American population. In 1935, he secured the support of President Franklin D. Roosevelt in lobbying states to adopt the model Uniform State Narcotic Act as a means of standardizing cannabis regulation at the state level. When state-by-state action proved insufficient for his goals, Anslinger turned his attention to federal legislation.
The resulting legislation was drafted by Anslinger himself. It was introduced in the House of Representatives as H.R. 6385 by Representative Robert L. Doughton of North Carolina on April 14, 1937. The Seventy-fifth United States Congress held hearings on the bill across April 27, 28, 29, 30, and May 4, 1937. Following those hearings, the bill was redrafted as H.R. 6906 and introduced with House Report 792. The Act was enacted on August 2, 1937, as Public Law 75-238, recorded at 50 Stat. 551. It placed a tax on the sale of cannabis and represented the first national regulation of the substance in United States history.
The constitutional basis for the legislation rested on the federal taxing power. Clinton Hester, then the Assistant General Counsel to the United States Treasury Department, explained this approach directly during the legislative process: the primary stated purpose of the bill was to raise revenue, because framing it as a tax measure meant that courts would not inquire into any other motivations Congress might have had in passing it. The Act was modeled on two existing precedents: the Harrison Narcotics Tax Act and the National Firearms Act. The Harrison Narcotics Act had been upheld by the Supreme Court twice, first by a five-to-four margin and then by a six-to-three margin. In March 1937, the Supreme Court upheld the constitutionality of the National Firearms Act insofar as it related to an occupational tax, in Sonzinsky v. United States, providing immediate precedent for the new cannabis legislation.
The economic context surrounding the Act has generated significant historical debate. The total production of hemp fiber in the United States had declined to around 500 tons per year by 1933, though cultivation had begun recovering modestly in 1934 and 1935. Some interested parties have argued that the Act's actual purpose was to suppress the hemp industry through prohibitive taxation, serving the financial interests of powerful businessmen including Andrew Mellon, William Randolph Hearst, and the Du Pont family.
According to this interpretation, newspaper magnate William Randolph Hearst recognized that cheap, rapidly grown hemp threatened his extensive timber holdings, which supplied the paper pulp for his newspapers. Mellon, who served as Secretary of the Treasury and was among the wealthiest individuals in the country, had invested heavily in the Du Pont family's newly developed synthetic fiber, nylon, which competed directly with hemp. The invention of the decorticator, a machine that made hemp processing more efficient, had raised the possibility that hemp might become an economical alternative to wood pulp in the paper industry. In 1916, United States Department of Agriculture chief scientists Jason L. Merrill and Lyster H. Dewey had published USDA Bulletin No. 404, "Hemp Hurds as Paper-Making Material," concluding that hemp-derived paper compared favorably with wood pulp. Spokespersons from Du Pont and various fiber manufacturers have disputed this narrative, arguing that their promotion of nylon was driven by its technical merits rather than any effort to eliminate hemp competition.
The Marihuana Tax Act remained the primary federal framework for cannabis regulation for over three decades. Its legal foundations were ultimately challenged in the landmark 1969 Supreme Court case Leary v. United States, in which the Court overturned the Act on the grounds that it violated the Fifth Amendment's protection against self-incrimination — requiring individuals to register and pay the tax effectively compelled them to incriminate themselves. Congress subsequently repealed the Act the following year, in 1970, replacing it with the Controlled Substances Act, which placed cannabis in the most restrictive drug schedule.
The Marihuana Tax Act of 1937 occupies an unusual place in American legal and cultural history. Officially framed as a revenue measure, it functioned in practice as a prohibition. It was enacted at a moment when federal power over individual behavior was expanding in multiple domains, shaped by moral anxieties, racial prejudice, economic competition, and bureaucratic ambition in complex and still-debated proportions. Its ultimate invalidation by the Supreme Court did not end federal cannabis prohibition but merely prompted Congress to reformulate that prohibition on different constitutional grounds — leaving a legacy that continued to define American drug policy well into the twenty-first century.
