The JDC was founded to support Jewish communities dislocated by war and natural disasters. Genealogists may be very interested in searching their Archives for family members who were uprooted as a consequence of World Wars 1 and 2, or who may have emigrated to Palestine before the creation of the State of Israel. Over 500,000 names are listed. Additionally there are primary source materials that would be of value to historians. Here is the link to the JDC website.