Letters, telegrams, cards, etc. to Ben and Rose Hecht, of both a business and personal nature. Since Rose Hecht annotated much of her husband’s incoming correspondence, and since she was highly involved in the critiquing and editing of Ben's writings and the management of his career, her incoming correspondence is interfiled with Ben’s. Topics of letters vary from friendly notes and congratulatory letters to correspondence relating to the business of publishing, screenwriting, and filmmaking. After the alphabetical run of correspondents there are several folders of letters grouped by similar subject, such as fan mail, requests of various kinds, permissions to quote material from Hecht’s works, and letters of notes and condolence after Ben Hecht’s death in 1964. A great deal of fan mail and requests pertain to Hecht's writings that address the Holocaust and Judaism (such as his Guide for the Bedevilled in 1944 and Perfidy in 1961), and the fan mail especially is rich in personal accounts from World War II veterans and Holocaust survivors. Some condolences, if they are from prominent celebrities and/or form part of a longer series of correspondence from the same person, are filed in the alphabetic run instead of at the end of the run.

For more correspondence, see also Series 7: Legal/Financial Files, Series 8: Jenny Hecht Materials (under Correspondence and in Scrapbooks), and Series 9: Scrapbooks (at the end of Volume 3, concerning A Child of the Century.