“I feel strongly about this: to stand quiet in the face of bigotry and to turn your eyes away from it is to back up the bigotry, and that’s not what I, or any history teacher, should be doing in our work,” he said.

“I said to school officials, I’m not pulling these facts out of my hat. It’s based on experience and work and if I’m wrong, show me where I’m wrong.

And there was silence.”