Passage: Neutsch's output included novels, short stories, children's books, essays, poems and screen-plays.   His writings dealt with societal problems in the real-life socialist East Germany, while remaining faithful to the party line.   His greatest success came with the 900-page novel "Spur der Steine" ("Trace of stones" 1964).   Its central theme is developments in the life of an initially rebellious construction worker who, by the end of the book, has become a well attuned conformist member of the socialist society.   Nearly half a million copies of the novel were produced, which involved 35 editions of which five came out after 1990. This made it one of the most successful pieces of East German literature.   A (much simplified) film version directed by Frank Beyer appeared in 1966, but it was withdrawn only three days after its first Berlin showing, following criticism from some party officials that its portrayal of The Party was insufficiently positive. It was only shortly before the wall came down in 1989 that "Trace of Stones" returned to East German cinemas.

Question: Who directed the film?
Frank Beyer