illegal immigration, and combined, the Jewish population of Palestine rose rapidly. While these conditions also led to increased Arab immigration, the rapid rise in Jewish immigrants eventually led to the 1936–1939 Arab revolt in Palestine. By 1938, the increasing pressure put on European Jews also led mainstream Zionists to organize illegal immigration. The Struggle Against Britain and the Nazis 1939–1948 The 1939 White Paper and the British break with Zionism In Britain the 1930s, British Labour Party politician, Oswald Mosley, established a new party, the British Union of Fascists, which claimed that "the Jews" were leading Britain to war and campaigned for peace with Germany; however, his antisemitic remarks resulted in membership dropping to below 8,000 by the end of 1935 and, ultimately, Mosley shifted the party's focus back to mainstream politics before he was interned in 1940 and the BUF proscribed. British support for Zionism was undermined by the 1936–1939 Arab revolt in Palestine and concern that millions of Jews would soon be seeking entry to Palestine. The Nuremberg Laws effectively revoked the citizenship of the 500,000 Jews of Germany, making them refugees in their own country. In March 1938 Hitler annexed Austria, making its 200,000 Jews stateless refugees. In September the British agreed to Nazi annexation of the Sudetenland, making a further 100,000 Jews refugees. In the absence of alternative destinations, over 100,000 German Jews headed for Palestine. In 1939 the British issued a White Paper in which they declared that a Jewish National Home now existed and that their obligations under the mandate were fulfilled. Further migration would be harmful to the Arab population. A further 10,000 Jews a year were to be admitted from 1939 to 1944 as well as a one-time allowance of 25,000 in view of the situation in Europe. After that Jewish migration would require (the extremely unlikely) agreement of the Arab majority (by this time Jews were about one-third of the population). The British promised the Arabs independence by 1949 and imposed restrictions on land purchases by Jews. The British were concerned about maintaining Arab support as Italian Fascist and German Nazi propaganda was targeting the Arab world (and winning support). Jewish support in the fight against Fascism was guaranteed. In Palestine, Zionists increasingly viewed the British as an enemy, but they deemed the fight against the Nazis more important. In 1940 a group led by Avraham Stern, later known as Lehi,