Exit 5/31

From the very beginning, our state and national constitutions and laws have laid great emphasis on procedural and substantive safeguards designed to assure fair trials before impartial tribunals in which every defendant stands equal before the law. This noble ideal cannot be realized if the poor man charged with crime has to face his accusers without a lawyer to assist him. . . .

—Gideon v. Wainwright, 1963

Which constitutional amendments were the basis for this decision?