"Rudyard Kipling" (1942). This is the closest passage in Orwell's writings that has been found to the following quotation popularly attributed to him: "People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf " (or sometimes, "We sleep safely at night because rough men stand ready to visit violence on those who would harm us").
George Orwell, Sonia Orwell, Ian Angus (1968). “The Collected Essays, Journalism and Letters of George Orwell: An age like this, 1920-1940”, Harvill Secker