In the aftermath of the Oct. 7 attack on Israel by Hamas two years ago, high school teacher Josh Hirsch posted comments on social media in support of Israel. It was unrealistic for Hamas to expect a ceasefire, he wrote, as long as they were holding hostages.

Soon afterward, a former student called for his firing. A note taped outside the door of his Adams County, Colorado, classroom contained his wife’s name and their home address. And a sticker that appeared on his chair read: “Israel is committing genocide in Gaza.”

The reaction startled Hirsch, the only Jewish teacher in his school building. For the first time in his 14-year career, he considered quitting. He stayed and joined an educators’ advocacy network created by the Anti-Defamation League, a way he saw to make schools more inclu

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