The chapter discusses the U.S. court system, which consists of both federal and state courts. At the top is the U.S. Supreme Court, which has the power to review all other courts. Below are the federal courts, organized into four tiers - magistrate courts, district courts, courts of appeals, and the Supreme Court. States each have their own court systems that generally mirror the federal structure. Courts hear both criminal cases involving the government and civil cases between private parties.