About the film
Nazi Concentration Camps, also known as Nazi Concentration and Prison Camps, is a 1945 American film that documents the liberation of Nazi concentration camps by Allied forces during World War II. It was produced by the United States from footage captured by military photographers serving in the Allied armies as they advanced into Nazi Germany. The film was presented as evidence of Nazi war crimes in the Nuremberg trials in 1945, and the Adolf Eichmann trial in 1961.
From the film's Wikipedia article (CC BY-SA 4.0).