In response to pervasive, state-sponsored racial disenfranchisement—manifested through literacy tests, poll taxes in some jurisdictions, discriminatory registration practices, and racially motivated changes to election procedures—Congress enacted the Voting Rights Act of 1965. The Act's key provisions included: (1) a coverage formula that identified jurisdictions with low voter registration or turnout in 1964 that also used "tests or devices" for voting (Section 4(b)); (2) an immediate suspension of such tests and devices in covered jurisdictions (Section 4(a)); (3) a preclearance requirement mandating that covered jurisdictions obtain approval from either the U.S. Attorney General or the U.S. District Court for the District of Columbia before implementing any change in voting procedures (Section 5); and (4) authorization for federal examiners and observers to assist with voter registration and elections in covered areas (Sections 6–9). The State of South Carolina, which fell within the Act's coverage, brought an original action in the Supreme Court against the U.S. Attorney General, seeking to enjoin enforcement of these provisions. South Carolina argued that the VRA exceeded Congress's enforcement power under Section 2 of the Fifteenth Amendment, violated principles of state sovereignty and equal treatment among the States (the so-called equal sovereignty principle), infringed the Tenth Amendment, and offended due process and separation-of-powers principles by shifting burdens to the States and lodging approval authority in the executive branch.
Whether key provisions of the Voting Rights Act of 1965—particularly the coverage formula, suspension of literacy tests, preclearance of voting changes, and appointment of federal examiners—are a constitutional exercise of Congress's enforcement power under Section 2 of the Fifteenth Amendment, consistent with federalism, equal sovereignty among the States, due process, and separation of powers.
Under Section 2 of the Fifteenth Amendment, Congress may use any rational means to enforce the constitutional prohibition against racial discrimination in voting. When faced with pervasive and well-documented constitutional violations, Congress may adopt prophylactic, targeted, and sometimes extraordinary remedies—such as suspending discriminatory tests, shifting evidentiary burdens, imposing preclearance of election-law changes, and appointing federal officers—to prevent ongoing and future evasion of constitutional guarantees. The Fifteenth Amendment limits contrary state authority; thus Tenth Amendment and general federalism objections yield where Congress acts within its enforcement power. Geographic tailoring does not offend constitutional principles so long as Congress rationally targets jurisdictions with demonstrated violations and provides mechanisms, such as bailout, to end federal oversight upon sustained compliance.
The Supreme Court upheld the challenged provisions of the Voting Rights Act of 1965 as a valid and constitutional exercise of Congress's enforcement power under Section 2 of the Fifteenth Amendment. The Court rejected South Carolina's federalism, equal sovereignty, due process, and separation-of-powers objections and denied the requested injunction.
The Court, per Chief Justice Warren, emphasized the extensive legislative record demonstrating entrenched, ingenious, and persistent forms of racial discrimination in voting throughout certain states and localities. Traditional, case-by-case litigation had proven too slow and ineffective, allowing jurisdictions to circumvent judicial decrees by rapidly adopting new discriminatory devices. In light of these "exceptional conditions," Congress reasonably determined that systemic and preventive remedies were necessary to make the Fifteenth Amendment fully effective. Applying a deferential standard grounded in McCulloch v. Maryland's "appropriate legislation" principle and the text of the Fifteenth Amendment, the Court concluded Congress could adopt any rational means to enforce the Amendment's guarantee. The suspension of literacy tests was justified because Congress found such tests had been used as instruments of racial discrimination; their temporary nationwide suspension in covered areas was an appropriate prophylactic measure. The preclearance regime was upheld because it required covered jurisdictions to demonstrate that proposed changes lacked discriminatory purpose or effect before they could be implemented, thereby preventing backsliding and evasion—precisely the mischief Congress sought to remedy. The mechanism also respected judicial process by allowing covered jurisdictions to seek approval from a federal court, not solely the Attorney General. The Court rejected South Carolina's claim that the Act violated the principle of equal sovereignty among the States. That principle, the Court explained, pertains to the terms of state admission and does not preclude differential treatment when Congress rationally tailors remedies to address demonstrated constitutional violations in particular jurisdictions. The VRA's coverage formula was rational because it used objective metrics (low registration/turnout and the use of tests or devices) correlated with documented discrimination, and it contained a bailout process enabling compliant jurisdictions to exit coverage, further ensuring proportionality and fairness. Objections grounded in the Tenth Amendment failed because the Fifteenth Amendment expressly limits state power over voting on account of race and grants Congress enforcement authority; where the Reconstruction Amendments apply, state sovereignty must yield. Due process and separation-of-powers arguments also fell short. The Court viewed burden shifting as a permissible legislative choice in a remedial scheme and noted that preclearance involved either executive review subject to standards or de novo judicial review in the D.C. District Court, preserving the role of the judiciary and providing adequate procedural protections. In sum, given the gravity and persistence of constitutional violations, the VRA's tailored, temporary, and reviewable measures were rational and appropriate means of enforcing the Fifteenth Amendment. The Court therefore sustained the Act's central provisions against all constitutional challenges.
Katzenbach is a cornerstone of constitutional law on congressional enforcement powers under the Reconstruction Amendments. It affirms that Congress may enact robust, prophylactic remedies—beyond simply mirroring judicially enforceable prohibitions—when there is a strong evidentiary record of persistent constitutional violations. The case also clarifies that targeted federal oversight of specific States can be constitutionally permissible when justified by objective criteria and accompanied by off-ramps like bailout. For law students, the decision illustrates federal courts' deference to congressional factfinding and remedial judgments in civil rights legislation; the limits of Tenth Amendment and equal sovereignty arguments when the Reconstruction Amendments are implicated; and the practical value of preventive remedies such as preclearance. Although Shelby County v. Holder (2013) later invalidated the VRA's then-current coverage formula as outdated and incompatible with contemporary equal sovereignty concerns, Katzenbach remains essential to understanding the origins, logic, and permissible scope of congressional enforcement authority.
South Carolina v. Katzenbach validated Congress's decision to confront systemic racial discrimination in voting with strong, preventive remedies. The Court's analysis grounded in the Fifteenth Amendment and McCulloch's "appropriate means" framework recognized that ordinary litigation proved insufficient against sophisticated evasion. In upholding preclearance, the suspension of tests and devices, and federal examiners, the Court affirmed that Congress may adopt targeted, temporary, and reviewable measures to ensure that constitutional rights are not merely theoretical.