Tens of thousands of Polish officers were secretly executed in the USSR during World War 2. The German occupying forces reported the first mass grave, in the village of Katyn in 1943, but Moscow only admitted to the killings in 1990. Dina Newman speaks to the son of one of the murdered officers, Waclaw Gasiorowski. Photo: Gasiorowski family in Warsaw in 1936. Credit: family archive.
