that judges "shall hold their Offices during good Behaviour." The term "good behaviour" is interpreted to mean that judges may serve for the remainder of their lives, although they may resign or retire voluntarily. A judge may also be removed by impeachment and conviction by congressional vote (hence the term good behaviour); this has occurred fourteen times. Three other judges, Mark W. Delahay, George W. English, and Samuel B. Kent, chose to resign rather than go through the impeachment process. Clause 3: Salaries The compensation of judges may not be decreased, but may be increased, during their continuance in office. Section 2: Judicial power, jurisdiction, and trial by jury Section 2 delineates federal judicial power, and brings that power into execution by conferring original jurisdiction and also appellate jurisdiction upon the Supreme Court. Additionally, this section requires trial by jury in all criminal cases, except impeachment cases. Clause 1: Cases and controversies Clause 1 of Section 2 authorizes the federal courts to hear actual cases and controversies only. Their judicial power does not extend to cases which are hypothetical, or which are proscribed due to standing, mootness, or ripeness issues. Generally, a case or controversy requires the presence of adverse parties who have a genuine interest at stake in the case. In Muskrat v. United States, , the Supreme Court denied jurisdiction to cases brought under a statute permitting certain Native Americans to bring suit against the United States to determine the constitutionality of a law allocating tribal lands. Counsel for both sides were to be paid from the federal Treasury. The Supreme Court held that, though the United States was a defendant, the case in question was not an actual controversy; rather, the statute was merely devised to test the constitutionality of a certain type of legislation. Thus the Court's ruling would be nothing more than an advisory opinion; therefore, the court dismissed the suit for failing to present a "case or controversy." A significant omission is that although Clause 1 provides that federal judicial power shall extend to "the laws of the United States," it does not also provide that it shall extend to the laws of the several or individual states. In turn, the Judiciary Act of 1789 and subsequent acts never granted the U.S. Supreme Court the power to review decisions of state supreme courts on pure issues of state law. It is this silence which