Duggan provided Soviet intelligence with confidential diplomatic cables, including from American Ambassador William Bullitt.
William Christian Bullitt, Jr. (1891–1967), American diplomat, journalist, and novelist
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William Marshall Bullitt (1873–1957), lawyer, author and Solicitor General of the United States, notable burglary victim
William Shakespeare | William Laud | William Blake | William | William III of England | William Morris | William McKinley | William Howard Taft | William Ewart Gladstone | William the Conqueror | William S. Burroughs | William Shatner | William Faulkner | William Randolph Hearst | William Wordsworth | William Tecumseh Sherman | William Hogarth | Prince William, Duke of Cambridge | William Penn | William Jennings Bryan | William Gibson | William Wilberforce | William James | William Makepeace Thackeray | Fort William | William Hanna | William Hague | William III | William Hurt | William Walton |
He attended soirees which such American cultural notables as Carl Van Vechten, F. Scott Fitzgerald and his wife Zelda, Louise Bryant and her future husband, diplomat William Bullitt.