The Pulitzer prize-winning photo depicts the execution of a Vietcong spy in Saigon during the Vietnam War. This article provides additional information on the photo: http://100photos.time.com/photos/eddie-adams-saigon-execution
The photo played a huge role in U.S. politics at the time and was one of a few powerful photos that influenced public perception of the war.
With November 2021 TOK essay prescribed title #1, essays have to focused on not just AOKs but actual disciplines. This photo / situation could fit into a number of different disciplines in history, the arts, ethics, and the human sciences. There are a large number of ways you could explore the difficulty in identifying a “clear line between accepted and disputed knowledge within a discipline.” Consider, for example, a discipline in the arts and in ethics and think about the role of the photographer and his decision to document the event without intervening.