In the face of the destructiveness of the new weapons and in anticipation of the nuclear arms race several project members including Bohr, Bush and Conant expressed the view that it was necessary to reach agreement on international control of nuclear research and atomic weapons.
Under indtryk af de nye våbens ødelæggelseskraft og i forventning om et våbenkapløb udtrykte adskillige projektdeltagere, heriblandt Bohr, Bush og Conant det synspunkt, at det var nødvendigt at nå frem til en aftale om international kontrol med atomforskning og atomvåben.