Question: What film by the well-known Russian film director who directed silent films such as "Strike (1925), and "Battleship Potemkin(1925) was based on the true story of Pavlik Morozov and thought to have been destroyed before its completion?
Sentence (from "Edmund Meisel"): He wrote the score to Walter Ruttmann's "" (1927), "The Battleship Potemkin" (1925), and other films of Sergei Eisenstein.
Relevant evidence: No