What was International organization formed to protect its members against aggression?

The international organization formed to protect its members against aggression is the United Nations (UN), established in 1945. Its primary purpose is to promote peace, security, and cooperation among nations to prevent conflicts and resolve disputes through diplomacy. The UN also includes various agencies and programs aimed at addressing global issues such as humanitarian aid, development, and human rights. Additionally, the UN Security Council plays a key role in maintaining international peace and security.