Wiretapping for national security : hearings before Subcommittee No. 3, Committee on the Judiciary, House of Representatives, Eighty-third Congress, first session on H.R. 408, to regulate the interception of communications in the interest of national security and the safety of human life : H.R. 477, to authorize acquisition and interception of communications in interest of national security and defense : H.R. 3552, authorizing acquisition and interception of communications in interest of national security : H.R. 5149, to authorize the use in criminal proceedings in any court established by act of Congress of information intercepted in national security investigations, May 4, 20, and July 8, 1953.