Printz v United States was a landmark Supreme Court case decided in 1997 that addressed the balance of power between the federal government and the states regarding gun control laws. The case ruled that certain provisions of the Brady Handgun Violence Prevention Act, which required state officials to conduct background checks on handgun purchasers, violated the principles of federalism by compelling state officials to enforce federal laws. This decision has significant implications for the interpretation of the Second Amendment and the limits of federal authority over state actions.