After leaving Africa. The Paulings attended the Fifth World Conference Against Atomic and Hydrogen Bombs in Hiroshima, where Pauling delivered a keynote speech, "Our Choice: Atomic Death or World Law." The appearance underlined his growing stature as a spokesperson for the peace movement. But he was only one of many. When he led an effort to prepare a simple summary of the conference’s concerns for publicity purposes, his relatively mild, scientific words were criticized by more radical members of the movement, leading to a prolonged and noisy debate. At one point, some members of the gathering walked out. Pauling was taken aback by the rancor, but kept working, and helped forge a compromise appeal that was eventually adopted. Again, he had proven himself a capable leader in the effort to halt the spread and development of nuclear weapons. "We were very well pleased with this conference," Pauling later wrote Bertrand Russell.