There have been many famous repeals or court decisions in American history. In 1954 the Supreme Court ruled that separate but equal (the American slogan for segregation of white and black Americans) was no longer constitutional, an act that negated their earlier ruling in 1896.
The first case in the U.S. in which the court system determined that a law was unconstitutional and should be repealed occurred in 1803. It was the case of Marbury v Madison, when the Supreme Court decided that the Judiciary Act of 1789 was conflicted with the Constitution and was therefore null and void.
The case of Betts v Brady ruled that the 6th and 14th Amendments of the constitution guaranteeing a right to legal counsel does not mean that the government has to provide counsel for someone who cannot afford it. Later, the case Gideon v Wainwright overruled this decision, and anyone accused of a crime is entitled to free counsel if he/she can’t afford an attorney.