Katyn massacre 卡廷大屠杀

The Katyn massacre (Polish:zbrodnia katyńska, mord katyński, "Katyń crime"; Russian:Катынский расстрел Katynskij rasstrel, "Katyn shooting") was a series of mass executions of Polish nationals carried out by the NKVD ("People's Commissariat for Internal Affairs", a Soviet secret police organisation) in April and May 1940. Originally, the term "Katyn massacre", also known as the Katyn Forest massacre, referred to the massacre at Katyn Forest, which was discovered first and was the largest execution of this type.