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Digital Archive International History Declassified

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  • October 02, 1944

    Letter from Boris Merkulov (USSR People’s Commissar for State Security) to Lavrenty Beria (USSR People’s Commissar for Internal Affairs)

    Letter from Merkulov to Beria regarding the KGB’s efforts to obtain information about the creation of the atomic bomb and specifically about the related problems with uranium

  • October 09, 1945

    TASS News Summary

    Stories include disputes in the US about putting the atomic bomb under international supervision, a speech by Truman on the atomic bomb, British conservative party politics, the dissolution of the national assembly in Portugal, elections in Budapest, and a speech by British Foreign Secretary Bevin on the conference of ministers of foreign affairs.

  • November 28, 1945

    Beria’s Cover Memo to Stalin on Niels Bohr

    Memo to Stalin discussing Beria’s efforts to obtain information from physicist Niels Bohr about development of the atomic bomb.

  • November 28, 1945

    The Interrogation of Niels Bohr

    At the end of October 1945 two NDVD employees of the “S” Department for atomic intelligence activities were sent to Denmark to establish contact and speak with Niels Bohr. They managed to meet Bohr at his institute twice, on 14 and 16 November 1945, and obtained answers to 22 questions on constructing a nuclear reactor and the atomic bomb.

  • December, 1945

    Kurchatov’s Evaluation of Niels Bohr's Questioning

    Evaluation by the scientific director of the Soviet nuclear project, Igor Kurchatov, of the interview with Niels Bohr.

  • June 15, 1947

    New York Herald Tribune, European edition, 'Joliot-Curie Rips America for Atomic Energy Report'

    French High Commissioner for Atomic Energy, Joliot-Curie, criticizes Henry DeWolf Smyth of Princeton University for omitting from his report the “vital contributions of French science to the discoveries leading to the making of atomic bombs.”

  • February 28, 1955

    Report by the Measurement Lab of the USSR Academy of Science, 'On the Properties of the Atomic Bombs Detonated on the Marshal Islands in 1954'

    Soviet scientific intelligence report on U.S. nuclear weapons testing on the Marshall Islands in 1954. This report concludes that the Ivy Mike and Castle nuclear detonations were thermonuclear based on gamma ray spectroscopy of fission fragments collected by Soviet aircraft over the USSR and PRC.

  • August 13, 1985

    Ciphered Telegram No. 214, Embassy of Hungary in India to the Hungarian Foreign Ministry

    Information on the current status of both Pakistan and India's nuclear programs. The opinion of Indian Vice President Venkataraman is that Pakistan is lying about having already completed an atomic bomb.