Klaus Fuchs

Klaus Fuchs is a German theoretical physicist that was a notorious spy working for the Soviet Union who was embedded within the Manhattan Project. Fuchs contributed many important theories to the development of the atomic bomb, such as helping develop the means needed to implode the critical fissionable core within the first atom bomb designs, his work on one of the bombs was actually “Fat Man” the one that got used to destroy Nagasaki. Many people reading this would think that Fuchs was an astonishing scientist but according to the “National Park Service” he ended up delivering detailed secrets about the energy yield of an atomic explosion and implosion methods, many people believe that the information that Fuchs delivered enabled the Soviet Union to develop their own atomic bombs at least one year sooner. In 1949, Fuchs was ousted as a spy and sentenced to 14 years in prison. https://www.nps.gov/mapr/learn/historyculture/scientists.htm

  J. Robert Oppenheimer

Oppenheimer was an American theoretical physicist that is widely renowned as the father of the atomic bomb, In 1942, Oppenheimer was chosen by the United States Army to manage the laboratory that aimed to weaponize atomic energy and was given a budget of $2 million as the Army recognized the importance of developing an atomic weapon before Germany. Oppenheimer returned to the United States where he worked as a physicist until eventually being sought out to lead the Manhattan Project. Oppenheimer’s understanding of fast neutrons and the logistics behind producing an atom bomb helped the Manhattan Project achieve its goal in 1945. From this information the United States developed the first nuclear weapon to beat Germany or the Nazis. https://online.norwich.edu/online/about/resource-library/who-were-manhattan-project-scientists

Leo Szilard and Enrico Fermi

 as part of the effort to build the first atomic bomb, to create the first nuclear fission reaction which would lead to the development of nuclear reactor prototype, Szilard believed a nuclear bomb could be built, and that the Germans may be doing so, but Fermi was skeptical, they disagreed from the very start of their collaboration about every issue that involved not science but principles of action in the face of the approaching war. As the war with Germany was coming to an end, the successful construction of the atomic bombs was well underway, at the end of the day despite their opposing position they worked with other scientists to create the first ever nuclear weapon. https://ui.adsabs.harvard.edu/abs/2002physics…7094B/abstract