Survivors of Nazi atrocities joined young Jewish activists outside the Paris Holocaust memorial Saturday to sound the alarm about resurgent antisemitic hate speech, graffiti and abuse linked to the Israel-Hamas war. The impact of the conflict is drawing increasing concern in France and beyond. Thousands of pro-Palestinian and left-wing activists rallied in Paris and around Britain on Saturday to call for a cease-fire, the latest of several such protests in major cities around the world since the war began.