The Society holds several collections of U.S. congressmen and senators that each contain small, amounts of material, generally legislative and constituent correspondence, pertaining to the Soviet Union, Cuba, the Korean War, Hungary, Vietnam, the United Nations, foreign affairs, communism, and disarmament:
Arthur Capper (1865–1951). Senator, 1919–49. 51 boxes.
Frank Carlson (b. 1893). Senator, 1950–69. 567 boxes.
Clifford Hope (1893–1970). Congressman, 1927 57. 263 boxes.
Chester Mize (b. 1917). Congressman, 1965–71 96 boxes. Descriptive inventory.