The Katyn massacre, kent as the Katyn Forest massacre (Pols: zbrodnia katyńska, mord katyński, 'Katyń crime'; Roushie: Катынский расстрел Katynskij ra'sstrel 'Katyn shooting') forby, wis a mass execution o Pols ceetizens carried oot bi the Fowk's Commissariat for Internal Affairs (NKVD), the Soviet secret police, in Aprile an Mey 1940, durin the Seicont Warld War.
Coordinates: 54°46′N 31°47′E / 54.767°N 31.783°E