Before the war crime trials actually convened, the Supreme Commander of the Allied Powers, its International Prosecution Section (IPS) and Japanese officials worked behind the scenes not only to prevent the Imperial family from being indicted, but also to influence the testimony of the defendants to ensure that no one implicated the Emperor. High officials in court circles and the Japanese government collaborated with Allied General Headquarters in compiling lists of prospective war criminals, while the individuals arrested as "Class A" suspects and incarcerated solemnly vowed to protect their sovereign against any possible taint of war responsibility. Thus, "months before the Tokyo tribunal commenced, MacArthur's highest subordinates were working to attribute ultimate responsibility for Pearl Harbor to Hideki Tōjō" by allowing "the major criminal suspects to coordinate their stories so that the Emperor would be spared from indictment." According to John W. Dower, "This successful campaign to absolve the Emperor of war responsibility knew no bounds. Hirohito was not merely presented as being innocent of any formal acts that might make him culpable to indictment as a war criminal, he was turned into an almost saintly figure who did not even bear moral responsibility for the war." According to Bix, "MacArthur's truly extraordinary measures to save Hirohito from trial as a war criminal had a lasting and profoundly distorting impact on Japanese understanding of the lost war."