Gideon v. Wainwright
Gideon was charged for breaking and entering. He couldn't afford an attorney and requested one from the court but was denied. He defended himself and was convicted to a 5 year state prison sentance.
6th Amendment, Right to fair trial
The court decided 9 votes Gideon, 0 votes against. Everyone has the right to a fair trial protected under the 6th Amendment.