A-Bomb- U. S. Tightens Security on Report of Red Blast; December 1949; Newspapers are shown as well as people reading them in the streets. The Russian delegate to the United Nations arrives and reporters gather around him. We see a wide shot of the UN meeting and close shots of various delegates. We see images of the tighter safety precautions now imposed on the atomic sites in the US, including security checkpoints, airplanes stopping cars along the road, guards in shooting practice, and armored cars.