Murió hace quince años
Diego Acuña was one of the five thousand children taken to Russia during the Spanish Civil War. He was educated in the communist pedagogy and prepared for a career as an agitator that developed in France and Italy under the command of Goeritz, one of the party officials. One day he was commissioned a delicate mission: assisting in the murder of his father, because he turns out to be a major obstacle to the illegal actions of communism. To do so he moves to Spain, pretending he is bored of Soviet doctrine
Starring Rafael Rivelles, Francisco Rabal, Lyla Rocco
Watch "Murió hace quince años" on FlixOlè released in 1954. It's a drama movie, and has a rating of 5.5 out of 10 from Imdb which is fairly okay for this kind of movie.