It was common in the Middle Ages for Jews to get the blame for the spreading of disease. In the 14th century, Jews were accused of poisoning wells, infecting the water with something terrible that was then transferred to the whole community. There was of course never one shred of evidence of this. The Black Death had nothing to do with the Jews—it was a bacterial infection transferred through many sources—but they caught the blame anyway. Indeed, that’s where we get the phrase “poisoning the well.” It has anti-Semitic connotations in history. Scapegoating Jews is a habit with ancient origins....