Swedish literature and has been translated to at least fourteen different languages. Contemporary to Söderberg was Bo Bergman. Further development of the novel is associated with writers such as Gustaf Hellström, Sigfrid Siwertz, Elin Wägner and Hjalmar Bergman. Modernism Pär Lagerkvist was one of the first modernists in Sweden. His expressionistic poem Ångest (Anguish, 1916) introduced modernist literature in Sweden. Lagerkvist also wrote prose and plays in works that addressed the great existential questions. In 1951 Lagerkvist was awarded The Nobel Prize in Literature. Another early modernist was Birger Sjöberg whose controversial expressionistic book of poems Kriser och kransar (Crises and Wreaths) appeared in 1926. The anxiety-ridden poems was an unexpected contrast to Sjöberg's earlier success with the idyllic and popular Fridas visor (1922). Both Lagerkvist and Sjöberg had an influence on the modernist poets of the 1930s and 1940s. Karin Boye was influenced by modernism and psychoanalysis. Boye is one of the most widely read poets in Sweden and is also known for the dystopic novel Kallocain (1940). Proletarian literature In 1929 Artur Lundkvist, Harry Martinson, Erik Asklund, Josef Kjellgren and Gustav Sandgren published the highly influential modernist poetry anthology Fem unga (Five Young Men). Swedish agriculture had a system with labourers called statare, who were paid in kind only, with product and housing, comparable with the Anglo-Saxon truck system. Among the few people with this background who made an intellectual career were the writers Ivar Lo-Johansson, Moa Martinson and Jan Fridegård. Their works were important to the abolition of the system. With works such as the novel Godnatt, jord (Goodnight, earth, 1933) that portrayed statare, Ivar Lo-Johansson became a dominating figure in Swedish proletarian literature. Moa Martinson's novels focused on poor women farm laborers and factory workers. An autobiographical novel series beginning with Mor gifter sig (My mother gets married, 1936) is widely read. Eyvind Johnson and Harry Martinson developed the Swedish autobiograpichal novel with works such as Johnson's novel series Romanen om Olof (1934–1937) and Martinson's Flowering Nettles (1935). Johnson also took a stand against nazism in his novel trilogy Krilon (1941-1943) and wrote acclaimed historical novels. Martinson became known as one of Sweden's finest nature poets and in 1956 he published his poetic space epic Aniara. In 1974 Johnson and Martinson shared the Nobel Prize in Literature. A well-known proletarian writer was Vilhelm Moberg (1898–1973). He usually wrote about the lives of ordinary people and in