reported details of the agreement to the GRU in Moscow, which she had probably obtained from Fuchs. Implementation Even before the Quebec Agreement was signed, Akers had already cabled London with instructions that Chadwick, Peierls, Oliphant and Simon should leave immediately for North America. They arrived on 19 August, the day it was signed, expecting to be able to talk to American scientists, but were unable to do so. Two weeks passed before American officials learned of the contents of the Quebec Agreement. Bush told Akers that his action was premature, and that the Combined Policy Committee would first have to agree on the rules governing the employment of British scientists. With nothing to do, the scientists returned to the UK. Groves briefed the OSRD S-1 Executive Committee, which had replaced the S-1 Committee on 19 June 1942, at a special meeting on 10 September 1943. The text of the Quebec Agreement was vague in places, with loopholes that Groves could exploit to enforce compartmentalisation. Negotiations on the terms of technical interchange dragged on until December 1943. The new procedures went into effect on 14 December with the approval of the Military Policy Committee (which governed the Manhattan Project) and the Combined Policy Committee. By this time British scientists had already commenced working in the United States. Over the next two years, the Combined Policy Committee met only eight times. The first occasion was on the afternoon of 8 September 1943; Stimson discovered that he was the chairman only that morning. This first meeting established a Technical Subcommittee chaired by American Major General Wilhelm D. Styer. The Americans did not want Akers on the Technical Subcommittee due to his ICI background, so Llewellin nominated Chadwick, whom he also wanted to be Head of the British Mission to the Manhattan Project. The other members of the Technical Committee were Richard C. Tolman, who was Groves's scientific advisor, and C. J. Mackenzie, the president of the Canadian National Research Council. It was agreed that the Technical Committee could act without consulting the Combined Policy Committee whenever its decision was unanimous. It held its first meeting at The Pentagon on 10 September 1943. There remained the issue of co-operation between the Manhattan Project's Metallurgical Laboratory in Chicago and the Montreal Laboratory. At the Combined Policy Committee meeting on 17 February 1944, Chadwick pressed for resources to build a nuclear reactor at what is