The Japanese were so concerned about the buildup of Jews in Japan that they created a Shanghai ghetto for them located here.

Shortly prior to and during World War II, and coinciding with the Second Sino-Japanese War, tens of thousands of Jewish refugees were resettled in the Japanese Empire. The onset of the European war by Nazi Germany involved the lethal mass persecutions and genocide of Jews, later known as the Holocaust, resulting in thousands of Jewish refugees fleeing east. Many ended up in Japanese-occupied China.

• http://en.wikipedia.org/wiki/Jewish settlement in the Japanese Empire