The Quebec Agreement was a secret agreement. Its terms were known to but a few insiders, and its very existence was not revealed to the United States Congress. The Joint Committee on Atomic Energy was given an oral summary on 12 May 1947. On 12 February 1951, Churchill wrote to President Harry S. Truman for permission to publish it, but Truman declined. Churchill therefore omitted it from his memoir, "Closing the Ring" (1951). It remained a secret until Churchill read it out in the House of Commons on 5 April 1954. However, on 4 September 1943 the Soviet atomic spy Ursula Kuczynski ("Sonia") reported details of the agreement to the GRU in Moscow, which she had probably obtained from Fuchs.