Sovietization of Western Byelorussia (1939–1941)

Sovietization of Western Byelorussia (1939–1941) was the initial period of establishing Soviet rule in Western Belorussia. It lasted from late September 1939 to 22 June 1941.

Source: Wikipedia — Sovietization of Western Byelorussia (1939–1941) (CC BY-SA 4.0)