The incidents come as anti-Semitic hate crimes are rising — by 54% from 2014 to 2017, according to the FBI. Knowledge of the Nazi atrocities among young people is decreasing. A study commissioned last year by the Conference on Jewish Material Claims Against Germany showed that 66% of U.S. millennials did not know what Auschwitz was. Four in 10 millennials thought 2 million or fewer Jewish people were killed during the Holocaust; the actual number is around 6 million. “Time, fragmented online echo chambers and ignorance have enabled bigotry and Holocaust denial a renaissance,” said Brian Levin, director of Cal State San Bernardino’s Center for the Study of Hate and Extremism.