This is a list of cases reported in volume 256 of United States Reports, decided by the Supreme Court of the United States in 1921. Justices of the Supreme Court at the time of volume 256 U.S. The Supreme Court is established by Article III, Section 1 of the Constitution of the United States, which says: "The judicial Power of the United States, shall be vested in one supreme Court . . .". The size of the Court is not specified; the Constitution leaves it to Congress to set the number of justices. Under the Judiciary Act of 1789 Congress originally fixed the number of justices at six (one chief justice and five associate justices). Since 1789 Congress has varied the size of the Court from six to seven, nine, ten, and back to nine justices (always including one chief justice). When the cases in volume 256 were decided the Court comprised the following nine members: Notable Cases in volume 256 U.S. Block v. Hirsh In Block v. Hirsh, 256 U.S. 135 (1921), the Supreme Court upheld a temporary rent control law in the District of Columbia. It set a precedent in American law that government can regulate housing conditions during times of emergency to maintain or improve living conditions. In 1924, however, the rental property statute upheld in the case reached the Court for a second review. This time, despite the language being the same, the statute was struck down. The Court held that the emergency necessitating the measure had passed, and that that which "justified interference with ordinarily existing property rights as of 1919 had come to an end by 1922." Newberry v. United States Newberry v. United States, 256 U.S. 232 (1921), is a decision by the Supreme Court which held that the United States Constitution did not grant the United States Congress the authority to regulate political party primaries or nomination processes. The Court struck down 1911 amendments to the Federal Corrupt Practices Act which placed spending limits on candidate and political election committee spending in primaries or other nomination processes for federal office. Brown v. United States In Brown v. United States, 256 U.S. 335 (1921), the Supreme Court held that if a person is attacked, and that person reasonably believes that they are in immediate danger of death or grievous bodily injury, then they have no duty to retreat and may stand their ground;