New York City’s Jewish community — the largest in the United States — is abounding with anxiety and friction a day ahead of an election that could give the city its first Muslim mayor. That candidate, Zohran Mamdani, has won over many progressive Jewish voters with vows to make the city more affordable and equitable. Yet he has alarmed many other Jews — in New York and across the U.S. — with harsh criticism of Israeli policies, including assertions that its military campaign in Gaza amounts to genocide.