At the start of World War II, Poland was partitioned between Nazi Germany and the Soviet Union (the Molotov–Ribbentrop Pact). The war resulted in the death of one-fifth of the Polish population, with 90% or about 3 million of Polish Jewry killed along with approximately 3 million Polish non-Jews. Examples of Polish gentile attitudes to German atrocities varied widely, from actively risking death in order to save Jewish lives, and passive refusal to inform on them; to indifference, blackmail, and in extreme cases, participation in pogroms such as the Jedwabne pogrom. Grouped by nationality, Poles represent the largest number of people who rescued Jews during the Holocaust.
In the postwar period, many of the approximately 200,000 Jewish survivors registered at Central Committee of Polish Jews or CKŻP (of whom 136,000 arrived from the Soviet Union) left the Communist People’s Republic of Poland for the nascent State of Israel and North or South America. Their departure was hastened by the destruction of Jewish institutions, post-war violence and the hostility of the Communist Party to both religion and private enterprise, but also because in 1946–1947 Poland was the only Eastern Bloc country to allow free Jewish aliyah to Israel without visas or exit permits. Britain demanded Poland to halt the exodus, but their pressure was largely unsuccessful. Most of the remaining Jews left Poland in late 1968 as the result of the Soviet-sponsored “anti-Zionist” campaign. After the fall of the Communist regime in 1989, the situation of Polish Jews became normalized and those who were Polish citizens before World War II were allowed to renew Polish citizenship. Religious institutions were revived, largely through the activities of Jewish foundations from the United States. The contemporary Polish Jewish community is estimated to have approximately 20,000 members, though the actual number of Jews, including those who are not actively connected to Judaism or Jewish culture, may be several times larger.