This file contains materials kept by Baker and his staff relating to the many senate standing, select, and joint committees that Baker was a member of or involved with because of his positions as minority and majority leader. The type of information in this file ranges from committee meeting notices to research materials on specific issues before a committee. A wide variety of types of documents are found in these files including: correspondence, memos, notes, reports, forms, clippings, statements, press releases, transcripts, and reference materials. Some of the materials show evidence of being kept by a specific office, such as the Minority Leaders Office (MLO) or by a specific staff member, such as Howard Leibengood (HL), a legislative assistant (and these codes have been added to the title).

Two committees dominate this file by their quantity of material; they are the Senate Foreign Relations Committee (4.5 cu. ft.) and the Select Committee on Presidential Campaign Activities, more commonly know as the Watergate Committee (8 cu. ft.). The Foreign Relations Committee section primarily contains folders by country but also contains a few subject and name folders. The predominate country/ topic among the Foreign Relations Committees files is the Panama Canal Treaties, a major issue in the senate in the late 1970's. Many of the Panama Canal folders appear to have been kept by James Cannon, Baker's Administrative Assistant.

Materials relating to the Watergate Committee comprise over half of the committee file. The Watergate materials are in five groups: clippings, miscellaneous, witnesses, final report drafts, and House and Senate publications. Almost all of the clippings are photocopies of newspaper or magazine articles from major newspapers including: Chicago Tribune, The Daily News (NY), The Evening Star and Daily News (DC), The New York Times, The Sun (Baltimore), The Wall Street Journal, and The Washington Post. The witnesses file contains information about and/or statements by people who were or could be brought before the committee to testify. In the publications group, a single copy of each of the House of Representatives Committee on the Judiciary's publications and the Senate Select Committee on Presidential Campaign Activities' publications that were in the collection has been retained here to aid researchers working in these files. (Public opinion mail relating to the Watergate issue can be found with the Public Opinion Mail in the Administrative Subgroup files).