The General Assembly, having entertained various proposals to amend the draft convention in its deliberations, adopted the Genocide Convention by unanimous vote of the 56 participants at its 179th plenary meeting, on 9 Dec 1948, by Resolution 260(III). The Convention entered into force on 12 Jan 1951.
The Sixth (legal) Committee considered this draft at its 63rd to 110th meetings and 128th to 134th meetings of the third session of the General Assembly in 1948 (See, Report of the Sixth Committee, A/760, 3 Dec 1948). A detailed description of the deliberations of the Committee and General Assembly is in, Matthew Lippman, “Genocide”, in International Criminal Law: Sources, Subjects and Contents, edited by M. Cherif Bassiouni, pp. 403-435 (2008).
On 3 March 1948, the Economic and Social Council, by Resolution 117(VI), established an Ad Hoc Committee on Genocide composed of national representatives (United States of America, Soviet Union, Lebanon, China, France, Poland and Venezuela), which prepared a second draft convention with commentaries (E/794, 5 April-10 May 1948).
By Resolution 180(II) of 21 November 1947, the General Assembly requested the Economic and Social Council to continue its work on the matter and to proceed with the completion of a convention without awaiting the receipt of observations by all Member States.
By Resolution 77(V) of 6 August 1947, the Economic and Social Council (ECOSOC) proposed to proceed as rapidly as possible with the consideration of the question of genocide, subject to any further instructions which it may receive from the General Assembly. States were invited to submit their observations on that draft (A/362, 25 Aug 1947).