Answer:
The case in which Chief Justice John Marshall established judicial review, giving the Supreme Court the power to overturn an act of Congress, was Marbury v. Madison, which was decided in 1803. This was a landmark decision in which the Supreme Court held that the principle of judicial review, which allows the Court to declare an act of Congress unconstitutional, was implicit in the United States Constitution. This decision greatly expanded the power of the Supreme Court and has had a lasting impact on the relationship between the judicial and legislative branches of government in the United States.