The OSA Group (Organization of Contemporary Architects) was an architectural association in the Soviet Union, which was active from 1925 to 1930 and considered the first group of constructivist architects.[1] It published the journal SA (Sovremmennaia Arkhitektura or 'Contemporary Architecture'). It published material by Soviet and overseas contributors. However this led to them being attacked as a 'Western' group and some individuals as being 'bourgeois'. After the closure of the group, their modernist approach to architecture and town planning was eliminated in the Soviet Union by 1934, in favour of social realism.