What did Niels Bohr ask the United Nations to support in his 1950 open letter?

In his 1950 open letter to the United Nations, the Danish physicist Niels Bohr advocated for the establishment of an "open world" between nations.1

Bohr believed that the development of the atomic bomb necessitated a new approach to international relations based on mutual confidence. He argued that fostering transparency and openness was the essential first step toward preventing a postwar nuclear arms race. This letter was the culmination of a long-standing personal campaign in which he had previously attempted to convince world leaders, including Winston Churchill and Franklin D. Roosevelt, of the urgent need for international cooperation and information sharing regarding atomic energy.1