Short answers, pulled from the story.
The Baruch Plan began on the 14th of June 1946 when Bernard Baruch presented a document to the United Nations Atomic Energy Commission. This proposal emerged from the March 1946 Acheson, Lilienthal Report drafted at President Truman's request.
Bernard Baruch wrote the bulk of the text while Undersecretary of State Dean Acheson and David E. Lilienthal drafted the initial report. An International Atomic Development Authority exercised total control over uranium mining and thorium extraction worldwide under UN supervision.
The Soviet Union refused to endorse the plan because they argued the United Nations remained dominated by American allies in Western Europe. Stalin viewed the inspection system as a tool for American dominance rather than global safety.
A critical clause demanded that no permanent Security Council member could veto punishment decisions which threatened traditional veto powers held by major powers like the Soviet Union. The deadlock over veto rights prevented serious advancement after late 1947.
The collapse of negotiations led both superpowers to accelerate their respective atomic weapons programs throughout 1947 and beyond. By 1949, the USSR became a nuclear power following years of secret research.