The Exis (pronounce "Exies") were a youth movement in Hamburg, Germany, in the 1950s. The Exis took their name from the existentialist movement, and were influenced by its chief proponents, Jean-Paul Sartre and Albert Camus. There are similar German nicknames for other movements, such as "Sozis" and the "Nazis". In the case of Hitler's party, the diminutive form was originally a joke, in imitation of "Sozis", because, in the mid-1920s, no one expected that the National Socialist German Workers' Party (or NSDAP) would ever be as successful as the mainstream Socialists.