As the Black Death epidemics devastated Europe in the mid-14th century, annihilating more than a half of the population, Jews were taken as scapegoats. Rumors spread that they caused the disease by deliberately poisoning wells. Hundreds of Jewish communities were destroyed by violence in the Black Death persecutions. Although Pope Clement VI tried to protect them by the July 6, 1348 papal bull and another 1348 bull, several months later, 900 Jews were burnt alive in Strasbourg, where the plague hadn't yet affected the city.[5]
http://en.wikipedia.org/wiki/Persecution_of_Jews#Christian_antisemitism So, is it fair to only blame the Nazis??