Felix Frankfurter,
Knapp v. Schweitzer — Opinion of the Court
“ It is plain that the amendment can no more be thought of as restricting action by the States than as restricting the conduct of private citizens. The sole-although deeply valuable-purpose of the Fifth Amendment privilege against self-incrimination is the security of the individual against the exertion of the power of the Federal Government to compel incriminating testimony with a view to enabling that same Government to convict a man out of his own mouth. ”
