These papers concern the investigation into Boas' alleged connections with the Communist party. The continuation of the files beyond the date of Boas' death most likely resulted from similar investigations into the activity of Boas' outspoken son, Ernst Boas.

Letters between various family members of Franz Boas, nearly all in German. Although the topics relate primarily to personal, familial matters, information about Boas's career and (more generally) his intellectual formation and beliefs.

Material collected by Muriel Rukeyser in the late 1940s and 1950s for a proposed biography of Franz Boas, including original manuscript materials of Boas, correspondence between Boas and Rukeyser, biographical data, early family letters and documents relating to him, school and military records, family reminiscences of Boas, and some professional correspondence. There is also material specifically related to the publication of Rukeyser's biography, including notes, a synopsis of the book, and correspondence with publishers and funding agencies. There are also some of Boas' and others' publications.

During the half century leading up to the Second World War, Franz Boas helped to define academic anthropology in the United States. Trained as a geographer at the University of Heidelberg, Boas worked initially on the Inuit of Baffin Island and subsequently on the cultures of the Indians of the Northwest Pacific Coast, becoming a leading figure in American anthropology by the first decade of the twentieth century. As Professor of Anthropology at Columbia University, Boas made significant theoretical contributions to ethnology, linguistics, and physical anthropology, helping to ingrain the four fields approach in his discipline and introducing the concept of cultural relativism into wide currency. He was, as well, a committed Socialist and an ardent opponent of both racism and fascism. This collection includes correspondence that Boas carried on with his colleagues in anthropology, as well as with those in the other social sciences and sciences. This correspondence is rich as a source for twentieth-century historians interested in "radical" social causes, since Boas was a socialist and an outspoken voice for progressive social causes.