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Before committing the Tree of Life massacre, the shooter, who blamed Jews for the caravan of “invaders” and who raged about it on social media, made it clear that he was furious at hias, founded as the Hebrew Immigrant Aid Society, a Jewish group that helps resettle refugees in the United States. He shared posts on Gab, a social-media site popular with the alt-right, expressing alarm at the sight of “massive human caravans of young men from Honduras and El Salvador invading America thru our unsecured southern border.” And then he wrote, “hias likes to bring invaders in that kill our people. I can’t sit by and watch my people get slaughtered. Screw your optics, I’m going in.”