I learn from history books that in 1956 the URSS' Communist Party amply criticized the doings of its former First Secretary, Joseph Stalin, died in 1953. With a perfect timing comes out in 1957 "The Girl in the Kremlin".
Back to the film: well, Stalin is not really dead. He is still alive, and plots to regain his dictatorial powers in a now (1957) slightly changed Soviet Union. This an admissible kern idea for a story for the movies: we were comfortable, to say one, with King Kong's destroying Tokyo... But I won't write about the plot: you can find an outline of it in this same site, or elsewhere. I'd like to focus on some other aspects. Here we go.
Thousands and thousands of films have been made with an underlying propaganda undercurrent, and some are very good. But when the thing is so blatant, with all the Soviets represented ab initio as pure idiots, then we are not there. It's like taking Americans (and the rest of the world of movie-goers) for just as many idiots (there undoubtedly have been many of them, and presumably there are still now), if you expect them to believe this nonsense. Paradoxically, those films, always with underlying propaganda, but serious, which treat the characters - whatever their political position - as human beings, just as a normal member of an audience considers her/himself, have the greatest effect. Assuming that something like a "normal" audience ever existed or will exist.