For almost 80 years, survivors of the Holocaust have brought us their stories, hoping that their voices of truth could lead to a more tolerant future. The surging antisemitism of this moment reveals a growing stain of modern hate, with fewer survivors left to cry out against it. But we can. I co-founded an organization that gives voice to stories from the Holocaust, honoring those who perished and those who survived. I am heartsick that these stories have so much disturbing relevance today. This is a time of antisemitism unleashed and spreading across the globe. Antisemitism casually voiced by some,...