One of the most noted instances was the Katyn massacre of April and May 1940, in which around 22,000 members of the Polish armed forces, police, and intelligentsia were executed.
Salah satu peristiwa yang terjadi di tengah upaya tersebut adalah pembantaian Katyn pada April dan Mei 1940, ketika 22.000 anggota angkatan bersenjata, polisi dan intelijensia Polandia dihukum mati.