After the Kielce pogrom of 1946 , the flight of Jews accelerated , with 100,000 Jews leaving Eastern Europe in three months . Operating in Poland , Romania , Hungary , Czechoslovakia , and Yugoslavia through 1948 , Berihah transferred approximately 250,000 survivors into Austria , Germany , and Italy through elaborate smuggling networks . Using ships supplied at great cost by the Mossad Le'aliyah Bet , then the immigration arm of the Yishuv , these refugees were then smuggled through the British cordon around Palestine . Bricha was part of the larger operation known as Aliyah Bet , and ended with the establishment of Israel , after which '' immigration '' to the Jewish state was legal , although '' emigration '' was still sometimes prohibited , as happened in both the Eastern Bloc and Arab countries , see , for example refusenik
Kielce pogrom
Kielce pogrom
Bricha