Cordell Hull, State Department and Founding of the UN
Planning the Conversations
The concentrated and systematic preparation for the Dumbarton Oaks Conversations started in December 1943. An “Informal Agenda Group” within the Department of State began on 9 December 1943 with a focus on “international organization discussions.” In June 1944, the group, named the “International Organization Group,” worked out proposals for the Conversations, which were discussed with President Roosevelt, Secretary Hull, American politicians, and legal, military, and other experts. A draft of “Tentative Proposals for a General International Organization,” dated 18 July 1944, was transmitted to the three other major powers.
https://www.doaks.org/about/history/dumbarton-oaks-conversations/planning