Marbury v. Madison
A federalist named William Marbury was apppointed as a justice of the peace in the District of Columbia. But this decision wasn't fully agreed on, and Marbury called an act of Congress and sued for his job in the Supreme Court.
Marbury's entitlement to his appointment is in question.
The ruling was 6 votes for Madison, 0 votes against. When the Constitution goes against an act of legislature the act is not possible. This gave the Supreme Court the power of Judicial Review.