 During the Tokyo War Crimes Trial, some of the defence lawyers tried to convince the International Military Tribunal of the Far East to launch a legal investigation into the matter of the legality of the first use of nuclear weapons, but their motions were ignored.One of these defence lawyers, Shoichi Okamoto, continued to deal with the issue after the trial was concluded.In February 1953, he published a booklet titled ""Genbaku Minso Wakumon" (Questions and Answers on the Civil Lawsuit over the Atomic Bombings)", in which he called upon individuals in Hiroshima and Nagasaki to take legal action against the U.S. government within the U.S. legal system.