Most synagogues of Kraków were ruined during World War II by the Nazis who despoiled them of all ceremonial objects, and used them as storehouses for ammunition, firefighting equipment, as general storage facilities and stables. The post-Holocaust Jewish population of the city had dwindled to about 5,900 before the end of the 1940s. Poland was the only Eastern Bloc country to allow free Jewish aliyah (emigration to Israel) without visas or exit permits upon the conclusion of World War II. By contrast, Stalin forcibly kept Russian Jews in the Soviet Union, as agreed to in the Yalta Conference. In recent time, thanks to efforts of the local Jewish and Polish organisations including foreign financial aid from the American Jewish Joint Distribution Committee, many synagogues underwent major restorations and serve religious and tourist purposes.