Answer:
The Jews
Step-by-step explanation:
The Black Death spread around Europe in 1348. During that period millions died and many Christians believed that those deaths were due to an international conspiracy led by the Jews to poison Christendom.
They believed that the leaders of the Jewish Community in Toledo initiated the plot and the main chief of the conspiracy was Rabbi Peyret.
Because of this Conspiracy, many Jews were arrested and tortured and forced to confess something that did not exist, this rumor led to the destruction of the Jewish community in Strasburg.