Facts of the Case

In 1974, Congress passed amendments to the Fair Labor Standards Act of 1938. The purpose of the amendments was to regulate minimum wage and overtime pay for state and local government employees. The National League of Cities, as well as several states and cities, challenged the constitutionality of the amendments.

Question

May Congress, acting under its commerce power, regulate the labor market of state employees, which the Tenth Amendment reserves to the states?

Conclusion

Congress may not regulate the labor market of state employees. The Tenth Amendment prohibits Congress from enacting legislation which operates "to directly displace the States' freedom to structure integral operations in areas of traditional governmental functions." While the power of Congress under the Commerce Clause is "plenary," that power has constitutional limits. In this case, the exercise of the commerce power ran afoul of the Tenth Amendment which protects the states' traditional activities.