Fifth Aliyah

The Fifth Aliyah refers to the fifth wave of the Jewish immigration to Palestine from Europe and Asia between the years 1929 and 1939, with the arrival of 225,000 to 300,000 Jews. The Fifth immigration wave began after the 1929 Palestine riots, and after the comeback from the economic crisis in Mandatory Palestine in 1927, during the period of the Fourth Aliyah. The end of this immigration wave was with the start of World War II.

This wave of immigration began as a pioneering one, but with the onset of racial persecution in Nazi Germany attained the character of a mass migration between 1933 and 1939, with at least 55,000 Jews from Central Europe immigrating to Palestine or residing there as semi-permanent residents. The riots in the British Mandate during 1936 had weakened the immigration wave, but during the years 1938-1939 thousands of immigrants came, some of them illegally.

...
Wikipedia