Chief Justice John Marshall's opinion in Marbury v Madison, 5 US 137 (1803) strongly affirmed the Judicial Branch's power of judicial review by nullifying Section 13 of the Judiciary Act of 1789. Judicial Review is a check on the power of the Legislative and Executive Branches.
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The Supreme Court is not in the Congress. The Supreme court is at the top of the judicial branch of government, a co-equal branch with Congess.
The United States Supreme Court
Marbury V. Madison.
Probably the fourth Chief Justice, John Marshall, who strengthened the Supreme Court and established the Judicial branch as a co-equal branch of government, although I've never seen anyone referred to as such.
The Constitution of the United States of America listed the third arm of the government as the Judicial branch. The first two were the Executive (Presidential) and the Legislative (Congress: House of Representatives and Senate).