About the film
The Karski Report, is a 2010 documentary film by Claude Lanzmann, with the interviews he carried out to Jan Karski in 1978 during the elaboration of Shoah. Karski (1914-2000) was a Polish resistance fighter, who through his series of reports, alerted the Allies during World War II to the atrocities perpetrated against the Jews.
From the film's Wikipedia article (CC BY-SA 4.0).