The collection consists of the personal papers of Duncan Chaplin Lee and his son, John Lee. Materials include Duncan Chaplin Lee's correspondence, writings, photographs, and biographical material regarding his personal and work life. Key within these materials are documents that chronicle Lee's evolving interest in Marxism-Leninism in the 1930s, his military service, and the events that surfaced after he was accused of espionage in 1948. This material was then used by historian Mark A. Bradley in his book, A Very Principled Boy: The Life of Duncan Lee, Red Spy and Cold Warrior. The papers of John Lee contain correspondence and research materials related to Duncan Chaplin Lee and the controversy surrounding his life and legacy. Materials range from 1896 to 2011.