Availability of information to Congress : hearings before a subcommittee of the Committee on Government Operations, House of Representatives, Ninety-third Congress, first session, on H.R. 4938 to amend the Freedom of Information Act to require that all information be made available to congress except where executive privilege is invoked, H.R. 5983 to amend the Freedom of Information Act to require the disclosure of information, upon request, to congress by the executive branch, and H.R. 6438 to amend the Freedom of Information Act to require that all information be made available to congress, April 3, 4, and 19, 1973