MAIN ORGANS OF UNITED NATIONS by keypoint The General Assembly The Secretariat. The Security Council The Trusteeship council. The Economic and Justice Specialized Agencies. Others are Viewing: UNITED NATIONS ORGANIZATION 1999 CONSTITUTION (MAIN FEATURES/SIGNIFICANCE) COMMONWEALTH OF NATIONS THE SECURITY COUNCIL ACHIEVEMENTS OF THE UNO COMMISSION FOR MEDIATION, CONCILIATION AND ARBITRATION ORGANIZATION OF PETROLEUM EXPORTING COUNTRIES (OPEC)