On July 4, 1945, the great atomic scientist Leo Szilard finished a letter that would become the strongest (and one of the very few) real attempts at halting President Truman’s march to using the atomic bomb – which was two weeks from its first test at Trinity – against Japanese cities.
It’s well known that as the Truman White House made plans to use the first atomic bombs against Japan in the summer of 1945, a large group of atomic scientists, many of whom had worked on the bomb project, raised their voices, or at least their names, in protest. They were led by the Szilard. On July 3, he finished a petition to the president for his fellow scientists to consider, which called atomic bombs “a means for the ruthless annihilation of cities.” It asked the president “to rule that the United States shall not, in the present phase of the war, resort to the use of atomic bombs.”