During the Second World War, 65% of the city's Jews perished in the Holocaust (vs. only 35% of Jews from Brussels). On April 14, 1941, the so-called "Antwerp pogrom" occurred when some 200 followers of the "Vlaams Nationaal Verbond" ("Flemish National Union"), "Volksverwering" ("People's Defense"), Anti-Jewish League and other pro-Nazi anti-Semitic groups burned two synagogues in the Oosten straat, smashed the windows of Jewish-owned shops, damaged religious symbols and harassed the Jewish population. In May–September 1942, some 1500 Jewish men from Antwerp were taken into forced labor in Northern France, building the "Atlantic Wall" for the Organisation Todt. From the end of July until November 1942, on three occasions, Jews in Antwerp were rounded up by the Germans with the collaboration of the local police. From a community of around 35,000 Jews in Antwerp before the war, some 15,000 remained in the city after 1945.