Frank W. Notestein contributed significantly to the science of demography and to a better understanding of population problems in world affairs. The Frank W. Notestein Papers contain correspondence, speeches, and writings documenting the research, ideas, career and leadership roles of this former Princeton professor, director of the Office of Population Research, and president of the Population Council.

This collection consists of the papers received and generated by the staff of the Washington, D.C. Office of the American Civil Liberties Union (ACLU) during the 1950s and 1960s. The ACLU is a leading defender of civil liberties in the United States. Founded in 1920, it has been the recipient of sharp criticism for its willingness to defend unpopular causes and has participated in a majority of the landmark cases to come before the Supreme Court in the twentieth century. The Washington Office's primary responsibility is to monitor legislative issues. In the 1950s the office worked against abuses caused by McCarthyism, including loyalty oath requirements, powers of legislative investigating committees, and censorship of free speech and expression. In the late 1950s and early 1960s, the office focused on civil rights issues and the defense of alternative means of self expression. The Washington Office was also deeply involved with defending the civil liberties of those associated with the federal government and its agencies.

The papers consist primarily of records maintained in William Fitts Ryan's congressional office in Washington, D.C. his district office in New York City, and campaign materials.

Charles W. Yost (1907-1981) led a varied career as a diplomat, United Nations representative, writer, and scholar. He was a member of the foreign service intermittently between 1930 and 1971, after which time he devoted himself full-time to writing and teaching. Yost's papers document his professional life in the Foreign Service, as well as his time in academia, and include his correspondence, writings, and photographs.

Karl S. Twitchell was an American mining engineer who conducted extensive surveys in the Middle East, Europe, and South America between 1915 and the 1950s. His papers document the span of his career, particularly his interest in the Middle East, and include correspondence, journals, notes, reports, writings, topical files, photographs, and maps. Personal documents and correspondence with family and associates are also contained.

The William P. Bundy Papers document Bundy's career in public service, including Deputy Assistant Secretary of Defense for International Security Affairs; Assistant Secretary of Defense for International Security Affairs; Assistant Secretary of State for East Asian and Pacific Affairs, and editor of Foreign Affairs. Additionally, the collection consists of correspondence and subject files for Bundy's 1998 book, A Tangled Web: The Making of Foreign Policy in the Nixon Presidency.

The papers of Joseph A. Robinson, Princeton Class of 1931, are comprised almost entirely of Robinson's letters to his family during the years 1941-1952, when Robinson worked in the Office of War Information and the Foreign Service. The collection includes some drafts and copies of his work, radio scripts and newspaper clippings, as well as photographs, currency, invitations and postcards. Some of the later letters cover portions of his term in the Foreign Service, though with significant gaps. The most fully documented year is 1946. Robinson was involved in the establishment of informational and cultural affairs agencies in Saigon and Warsaw, and describes the internal politics and external challenges of creating an American news presence overseas.

This collection contains excerpts from the diaries of Osmond K. Fraenkel, a New York City lawyer who served on the ACLU's Board of Directors and as one of its general counsel. These excerpts discuss the cases in which Fraenkel was involved.

Howard A. Loeb served as chairman of the board of the Tradesmens Bank and Trust Company of Philadelphia, Pennsylvania and as representative of the Federal Reserve Bank of Philadelphia on the Federal Advisory Council. This collection consists of Loeb's correspondence and printed matter related to these positions.

The organization that became Americans United for Separation of Church and State was founded in 1947 to protect church-state separation and religious freedom, as well as to educate lawmakers, religious leaders, and the general public regarding Constitutional religious liberties. The records document the administration and issues of the organization from its founding and include correspondence, meeting materials, and publications.