Collections of the organization document the history of the Sisters in Los Angeles and California from 1926-present. Particular emphasis is given to Hungarian immigrant experience and social services with Hispanic neighborhoods. Archives also include records which reflect the activities of the Social Service Auxiliary and Juniors of Social Service.

As the only collecting institution focused solely on the art, craft, and history of Hollywood writers and their labor union, the Writers Guild Foundation Library & Archive are vividlly relevant to the creative and business communities of Los Angeles. The holdings document a rich facet of Los Angeles culture in relation to the role of writers in the entertainment industry.