 He is mentioned in George Orwell's autobiographical account of the Civil War, "Homage to Catalonia" (1938), and towards the end of the book, when Orwell describes the Barcelona May Days.In his account, Orwell testifies to Kopp's personal bravery in the Barcelona episode in single-handedly preventing further bloodshed.Meanwhile Kopp had a relationship with Orwell's wife Eileen O'Shaughnessy (Orwell and Eileen had a "somewhat open marriage").