The United Nations Atomic Energy Commission (UNAEC) was founded on 24 January 1946 by the very first resolution of the United Nations General Assembly "to deal with the problems raised by the discovery of atomic energy.
"[1] The General Assembly asked the Commission to make specific proposals: (a) for extending between all nations the exchange of basic scientific information for peaceful ends; (b) for control of atomic energy to the extent necessary to ensure its use only for peaceful purposes; (c) for the elimination from national armaments of atomic weapons and of all other major weapons adaptable to mass destruction; (d) for effective safeguards by way of inspection and other means to protect complying States against the hazards of violations and evasions.
[1] On 14 December 1946, the General Assembly passed a follow-up resolution urging an expeditious completion of the report by the Commission as well as its consideration by the United Nations Security Council.
[4] On 14 June 1946, the United States representative to the Commission, Bernard Baruch, presented the Baruch Plan, wherein the United States (at the time the only state possessing atomic weapons) would destroy its atomic arsenal on the condition that the U.N. imposed controls on atomic development that would not be subject to United Nations Security Council veto.
The plan was passed by the Commission, but not agreed to by the Soviet Union who abstained on the proposal in the Security Council.