World War II: German troops, aided by local auxiliaries, murder nine thousand residents of the Słonim Ghetto in a single day.

The Słonim Ghetto was a Nazi German ghetto established in 1941 by the SS in Slonim, Western Belarus, German-occupied Poland during World War II. Prior to 1939, the town (Słonim) was part of the Second Polish Republic. The town was captured in late June 1941 by the Wehrmacht in the early stages of Operation Barbarossa. Anti-Jewish measures were promptly put into place, and a barb-wire surrounded ghetto had been created by 12 July. The killings of Jews by mobile extermination squads began almost immediately. Mass killings took place in July and November. The survivors were used as slave labor. After each killing, significant looting by the Nazis occurred. A Judenrat was established to pay a large ransom; after paying out 2 million roubles of gold, its members were then executed. In March 1942, ghettos in the surrounding areas were merged into the Słonim ghetto.