Miranda warning
The Sixth Amendment protects the right to a lawyer, but the Supreme Court had also just recently made two landmark decisions about this right.  In 1963, the Court ruled in Gideon v. Wainwright, , that anyone being tried for a crime had the right to a lawyer.  If the person could not pay for a lawyer, the state had to assign them a free lawyer.  The next year, the Court ruled in another landmark case called Escobedo v. Illinois, , that anyone suspected of a crime had the right to have a lawyer with them while the police questioned them.