Texas H Christ

"If the government becomes a law breaker, it breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy. To declare that in the administration of the criminal law the end justifies the means 'to declare that the government may commit crimes in order to secure the conviction of a private criminal' would bring terrible retribution."

Louis D Brandeis

from dissenting opinion in Olmstead Vs United States, in which the court upheld the use of wiretaps in a case involving an investigation of bootlegging.