Experience should teach us to be most on our guard to protect liberty when the Government’s
purposes are beneficent. Men born of freedom are naturally alert to repel invasion of their
liberty by evil-minded rulers. The greatest dangers to liberty lurk in insidious encroachment
by men of zeal, well-meaning but without understanding.Justice Brandeis,
dissenting
Olmstead v. United States
277 U.S. 438, 479 (1927)