In 1934, after Hitler's rise to power, Bernstein was deprived from his chair. Bernstein then emigrated to the USA. After the war, Bernstein returned to Europe and died of cancer in Zurich on December 3, 1956.
J. F. Crow. Felix Bernstein and the First Human Marker Locus. Genetics. 1993 January; 133(1): 4–7. (PDF)