Rocket Attack U.S.A.

A cold-war propaganda film, released not too long after the launch of Sputnik, intended to rally public support for an anti-ballistic missile program. Based on the assumption that Sputnik is gathering intelligence for the Soviets, a spy is sent to Moscow to determine just how far along their missile program is. Surprise, surprise; Sputnik gave them all the data they need to build one nuclear missile, which is ready to launch against the U.S. (imdb)