There has been an increase of threats against Muslims and Jews since the Oct. 7 attack, Homeland Security Secretary Alejandro Mayorkas said before a Senate panel last week. “In the days and weeks since, we have responded to an increase in threats against Jewish, Muslim, and Arab-American communities and institutions across our country,” Mayorkas said. “Hate directed at Jewish students, communities, and institutions add to a preexisting increase in the level of antisemitism in the United States and around the world.” The Council on American-Islamic Relations had compiled 774 complaints of bias and other incidents since Oct. 25, including the...