The Unseen Holocaust (2014)

Documentary shedding further light on reports that the Nazis' systematic genocide against Jewish Europeans was even more widespread than initially thought. Drawing evidence from a film archive found in a Russian vault and diary extracts written by people on both sides of the conflict, the programme suggests that German police occupying Stalin's territories killed more than one million Soviet Jews before the Holocaust was even thought to have begun

http://www.tvguide.co.uk/detail/1904187/95820811/the-unseen-holocaust