NKVD PRISONER MASSACRES

            On this date, September 17, 1939, the Soviet Union joins Nazi Germany's invasion of Poland during the Polish Defensive War of 1939. I will post information about the NKVD Prisoner Massacres from Wikipedia.

NKVD prisoner massacres
The corpses of victims of Soviet NKVD murdered in last days of June 1941, just after outbreak of German-Soviet War (NKVD prisoner massacres) and escape of Red Army and NKVD troops from the cities. Here: Lwów, citizens of Lwów are looking for their friends and relatives, previously arrested by NKVD and kept in prison.
Date	June 1941 - November 1941
Location	Occupied Poland, Ukrainian SSR, Belorussian SSR, the Baltic states, Bessarabia
Type	Extrajudicial killings
Participants	NKVD and NKGB (united 20 July 1941)
Deaths	In excess of 100,000

The NKVD prisoner massacres were a series of mass executions carried out by the Soviet NKVD secret police during World War II against political prisoners across Eastern Europe, primarily Poland, Ukraine, the Baltic states, Bessarabia and other parts of the Soviet Union from which the Red Army was retreating following the Nazi German attack on the Soviet positions in occupied Poland, known as Operation Barbarossa.

Estimates of the death toll vary between locations; nearly 9,000 in the Ukrainian SSR, 20,000–30,000 in eastern Poland (now part of Western Ukraine), with the total number reaching approximately 100,000 victims of extrajudicial executions in the span of a few short weeks.