Klassenverhältnisse, known in English as Class Relations, in French as Amerika, rapports de classe, is a 1984 film by the French filmmaking duo of Jean-Marie Straub and Danièle Huillet. It is based on Franz Kafka's unfinished first novel, Amerika.

Amerika, (German working title Der Verschollene, "The Missing") also known as The Man Who Disappeared (Amerika), Amerika: The Missing Person and Lost in America, is the incomplete first novel by author Franz Kafka (1883–1924), written between 1911 and 1914 and published posthumously in 1927. The novel originally began as a short story titled "The Stoker". The novel incorporates many details of the experiences of his relatives who had emigrated to the United States. The commonly used title Amerika is from the edition of the text put together by Kafka's close friend, Max Brod, after Kafka's death in 1924. It has been published in at least three major English-language versions: as Amerika, translated by Edwin and Willa Muir (1938); as The Man Who Disappeared (Amerika), translated by Michael Hoffmann (1996); and as Amerika: The Missing Person, translated by Mark Harman (2008).