Opinion: The many faces of antisemitism can be tricky to identify. Defining it helps us fight it. The tools for understanding antisemitism are before us. It’s time for us all to use them. Siegler is board member of the region’s American Jewish Committee and lives in San Diego. Hirschhaut is regional director of the American Jewish Committee and lives in Los Angeles. Antisemitism is sneaky. It can be subtle as often as it is blatant. U.S. ties to Israel are in the spotlight as antisemitism is on the rise and the Israeli-Palestinian conflict is in the news. Two weeks ago,...