In 1941, at age 16, life for young Zvi Zucker from Czernowitz, Romania, took a dramatic turn. After his mother died in the ghetto, he had been put on a train headed for a concentration camp, but Zucker decided to escape and jumped out. A friend who was with him on the train declined to join him because he didn’t want to leave his parents. Zucker had nothing to lose at that point. “I wouldn’t have jumped...