Born Chaim Thau on 7 July 1921 in the
shtetl of Zabłotów (present-day
Zabolotiv, Ukraine) in eastern Poland, he grew up in an agrarian Jewish family. His father, Mordechai, was a merchant peddler operating from the family farm, while his mother, Esther, taught
Yiddish, German, and Polish from their home, which also functioned as a small classroom. He had two younger brothers. Zabłotów was a market town with roughly equal Jewish and Christian populations. Archival tax records place the Thau family among the more highly assessed households. In this multilingual environment, he became proficient in several languages. In September 1939, Germany and the Soviet Union signed the
Molotov–Ribbentrop Pact, leading to the partition of Poland at the outset of World War II. Zabłotów came under Soviet administration. Russian was subsequently mandated as the language of instruction in local schools. With unexpected Russian soldiers then stationed in Zabłotów, and Thau's interaction with the soldiers, Thau learned Russian which added to his existing knowledge of Polish, German, Yiddish, and Hebrew. Contemporary accounts indicate that some residents initially welcomed the Soviets and perceived their presence as protective, but soon the region was incorporated into the Soviet system. This environment of cultural diversity and relative stability would be abruptly shattered with the German invasion in 1941. == Nazi invasion and persecution ==