two historical examples of violence to ward jews before the holocaust
1348 - Jews are blamed for spreading the Black Death by deliberately contaminating wells and by "anointing" people and houses with poison. The Jews are herded into wooden buildings and burned alive. At Strasbourg more than 2,000 Jewish scapegoats are hanged on a scaffold erected at the Jewish burying ground.
1099 - Crusaders break into Jerusalem, and set fire to a synagogue where Jews are taking refuge, burning them to death. Those who survived are sold as slaves or ransomed.