Einstein the famous physicist, There are those who say that it is not related to the manufacture of the atomic bomb and that his nuclear project was for peaceful purposes (as Iran says). And There are those who say that he received a letter from three German scientists warning of the necessity of accelerating the manufacture of the atomic bomb before the Germans made it, Einstein received it from them and handed it to President Roosevelt, from which the Manhattan Project was launched. After the attacks on Hiroshima and Nagasaki, he said: We prepared the bomb to resist the Germans, and Truman is throwing it at the Japanese."