The Johnson Act and Tribal Gaming: The Law Behind Class II and III

Most discussions of tribal gaming law begin and end with the Indian Gaming Regulatory Act of 1988. But IGRA did not write on a blank slate. It was layered on top of an older federal statute that still shapes what kinds of machines a tribal casino can legally operate today: the Johnson Act. Understanding this earlier law explains why the distinction between Class II and Class III gaming is not merely bureaucratic, but the difference between a lawful machine and a federal crime.

What the Johnson Act prohibits

The Johnson Act — formally the Gambling Devices Act, codified at 15 U.S.C. sections 1171 through 1178 — was enacted in 1962 to curb the interstate movement of slot machines and similar equipment. Its core provision, section 1175, broadly prohibits the manufacture, possession, use, sale, or transportation of any “gambling device” within Indian country, the District of Columbia, U.S. possessions, and other federal enclaves. In plain terms, before IGRA, the federal government treated a slot machine on a reservation as contraband. The law made gambling devices on Indian lands a criminal matter, full stop.

That prohibition is the legal backdrop against which all of tribal gaming developed. When tribes began operating bingo and card games in the 1970s and 1980s, the Johnson Act loomed over any attempt to introduce mechanical or electronic gaming devices. The Supreme Court’s 1987 decision in California v. Cabazon Band affirmed tribes’ right to conduct certain gaming free of state control, a ruling we cover in our explainer on the Cabazon case — but Cabazon did not erase the separate federal barrier the Johnson Act erected against gambling devices specifically.

How IGRA changed the picture

IGRA did not repeal the Johnson Act. Instead, it carved two precise exceptions into it — and those exceptions map directly onto the gaming classes that define the modern industry.

IGRA did not abolish the Johnson Act’s ban on gambling devices in Indian country. It created two narrow doorways through it — one for compacted Class III machines, one for Class II electronic aids.

The first exception covers Class III gaming. The Johnson Act’s prohibition is made inapplicable to gambling devices used under a tribal-state compact, provided the compact is entered into by a state in which such devices are legal. This is why a tribe cannot simply install slot machines on its own authority: the machines are lawful only inside the framework of a negotiated, federally approved compact. Remove the compact, and the Johnson Act’s criminal prohibition snaps back into place.

The second exception covers Class II gaming. IGRA allows tribes to use computers and other electronic or technologic aids in the play of bingo, lotto, pull-tabs, and similar games. The key legal concept is that these systems are aids to a permitted game, not freestanding “gambling devices” within the meaning of the Johnson Act. A Class II machine is, in legal theory, an electronic facilitator of a bingo game played among participants — not a slot machine. We explain the mechanics in our guide to how Class II machines work.

Why the distinction still matters

The Johnson Act is the reason the Class II versus Class III line is policed so carefully. A Class II machine that crosses the line into functioning as a true slot-machine “facsimile” risks being classified as a Johnson Act gambling device — unlawful unless covered by a compact. Manufacturers and tribal regulators therefore design and certify Class II systems to ensure they remain genuine bingo aids, with outcomes determined by a central bingo game rather than by each terminal independently. The broader framework separating the two classes is laid out in our Class II versus Class III explainer.

This matters most for tribes in states that refuse to negotiate Class III compacts. For them, Class II gaming is not a second-best option but the only lawful path to machine-based gaming — and the Johnson Act is precisely why that path must stay within strict technical bounds. The National Indian Gaming Commission’s general counsel maintains guidance on Johnson Act compliance for exactly this reason.

The Johnson Act’s long shadow also explains decades of litigation over what counts as a permissible Class II aid. Because the financial difference between a Johnson Act gambling device and a lawful bingo aid can be enormous, manufacturers, tribes, regulators, and the Justice Department have repeatedly tested the boundary in court. The recurring question is whether a given electronic machine merely helps players participate in a common bingo game or instead operates as a self-contained game of chance — the legal hallmark of a slot machine. Those disputes are not academic hair-splitting; they determine which machines a tribe in a non-compacting state can lawfully deploy.

The takeaway is that tribal gaming sits atop two layers of federal law, not one. IGRA is the affirmative framework that authorizes and regulates Indian gaming, but it operates against the older prohibitory backdrop of the Johnson Act. Every lawful gaming machine on tribal land in the United States exists in one of the two doorways IGRA cut through that prohibition. Readers who want the full statutory structure can consult our Legal Guide.