During the Manhattan Project, Los Alamos National Labs (LANL) designed, built, tested and helped deliver the world's first atomic bombs for combat. Only four years later, the Soviet Union tested its first atomic bomb, bringing America's nuclear monopoly to an end and initiating the arms race. LANL historian Alan Carr discusses the important role espionage played in helping Joseph Stalin, one of history's most prolific mass murderers, acquire nuclear weapons.

Alan Carr is currently the historian for Los Alamos National Laboratory. He has produced publications on the Manhattan Project, nuclear weapons testing, and the Lab's development during the Cold War years. He completed graduate studies at Texas Tech University; his thesis, The Long Road to Kursk: The Development, Abandonment, and Relearning of Soviet Military Strategy, traces Soviet operational art from its roots in the early 1920s through the first half of World War II.