High Quality Content by WIKIPEDIA articles! George Abramovich Koval (Russian: Жорж (Георгий) Абрамович Коваль, Zhorzh Abramovich Koval, December 25, 1913 – January 31, 2006) was an American who acted as a Soviet intelligence officer. According to Russian sources, Koval`s infiltration of the Manhattan Project as a Glavnoye Razvedyvatel`noye Upravleniye (GRU) agent "drastically reduced the amount of time it took for Russia to develop nuclear weapons."