Aliyah Bet
Illegal migration (Aliyah Bet) became the main form of Jewish entry into Palestine. Across Europe Bricha ("flight"), an organization of former partisans and ghetto fighters, smuggled Holocaust survivors from Eastern Europe to Mediterranean ports, where small boats tried to breach the British blockade of Palestine. Meanwhile, Jews from Arab countries began moving into Palestine overland. Despite British efforts to curb immigration, during the 14 years of the Aliyah Bet, over 110,000 Jews entered Palestine. By the end of World War II, the Jewish population of Palestine had increased to 33% of the total population.