shoots the proposal down in the UN security council.
This misstates where the Baruch Plan was presented and where it failed. Baruch presented it to the United Nations Atomic Energy Commission (UNAEC), and its adoption was blocked there by Soviet and Polish abstentions—not by a Security Council vote killing the proposal.
Full reasoning
The Baruch Plan was not proposed to, or voted down by, the UN Security Council in the way this sentence suggests.
According to the U.S. Department of State's Office of the Historian, Bernard Baruch presented the plan "before a session of the United Nations Atomic Energy Commission (UNAEC)" on June 14, 1946. The same source says the decisive vote was held on December 30 in the UNAEC, where 10 of the 12 members voted in favor and the Soviet Union and Poland abstained; because unanimity was required, those abstentions thwarted adoption of the Baruch Plan.
The Security Council was relevant to the plan's enforcement structure, because the proposal would have limited veto power over sanctions for violations. But the plan itself was not simply "shot down in the UN Security Council."
1 source
- The Acheson-Lilienthal & Baruch Plans, 1946 | Office of the Historian, U.S. Department of State
On June 14, 1946, before a session of the United Nations Atomic Energy Commission (UNAEC), U.S. representative Bernard Baruch, presented a proposal... The vote was held on December 30, with 10 of the UNAEC's 12 members in favor, while the other two members (the Soviet Union and Poland) abstained... the Polish and Soviet abstentions thwarted the adoption of the Baruch Plan.