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

World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

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.