Army surveillance, like Army regimentation, is at war with the principles of the First Amendment. . . There can be no influence more paralyzing of that objective than Army surveillance. When an intelligence officer looks over every nonconformist’s shoulder in the library, or walks invisibly by his side in a picket line, or infiltrates his club, the America once extolled as the voice of liberty heard around the world no longer is cast in the image which Jefferson and Madison designed . . .