The following excerpt is from United States v. Fay, 333 F.2d 12 (2nd Cir. 1964):
The reason would seem to be that "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 * * * Government to compel incriminating testimony * * * to convict a man out of his own mouth." Knapp v. Schweitzer, 1958, 357 U.S. 371, 380, 78 S.Ct. 1302, 1308, 2 L.Ed.2d 1393.
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