This collection consists of correspondence, interviews, articles, notes, lectures, speeches, photographs, and audiovisual materials that document Fischer's life as a journalist, writer, commentator on international affairs, and a founder of the Liberal Party (1944). The collection includes the papers of Fischer's wife, Bertha "Markoosha" Mark Fischer, as well as family correspondence and papers. General correspondence focuses on the Soviet Union, India, and Spain during the Spanish Civil War and is primarily personal in nature. Notable correspondents and interviewees include Svetlana Allilueva, Georgii Chicherin, Jawarhalal Nehru, Eleanor Roosevelt, President Sukarno of Indonesia, Josep Broz Tito, Sumner Welles, and Fischer's sons, George and Victor. Fischer's service in Palestine, early attempts at making his 1950 book on Gandhi into a motion picture, his ideas for undermining Stalin's position in Soviet public opinion, and his early life and life in Princeton are well documented. Other important correspondence documents Fischer's impressions of interviewees, his involvement in the Spanish Civil War, and relationships with publishers and the media. Writings contain Fischer's articles for magazines and lectures, speeches, reviews and notes. Interviews and conversations are with politicians and groups of people Fischer met in his overseas travel. Financial and administrative records include tax returns and appointment books. Clippings and reviews document Fischer's public life and book reviews. Miscellaneous items relate to Fischer's life and include his early research papers on the Soviet Union. Photographs and films document Fischer's early work and travel and the Fischer family, and sound recordings include Fischer's talks and interviews.

The Markoosha Fischer Papers document her life in Europe as well as her time in the United States and include family and other correspondence, writings, and personal materials. Notably, Markoosha's papers contain material relating to her own books, which were based on her experiences in the Soviet Union and in Germany where she worked in displaced persons camps for the International Rescue and Relief Committee (IRRC) between 1948 and 1951. Her unpublished manuscripts include a full account of her experiences as a secretary and translator at the 1922 Genoa Conference, with a description of the Russian officials she met.