Czechoslovak architecture group formed in Prague in 1930 by Karel Janu (b 1910), Jirí Stursa (b 1910) and Jirí Vozenílek (1909–86). The three were architectural students of the Czech Technical University, Prague, and were among the most active members of the architectural section of the Left Front and, after 1933, of the Union of Socialist Architects. The group’s activities were divided between urban planning and architecture. It evolved the concept of belts of development for towns, based on socialist principles of urban planning, and it presented its own contribution to this concept through studies undertaken in the environs of Prague. In architecture, it promoted scientific methods of design, working on a programme of standardization and prefabrication of structural elements. The group was active until 1937. All three members played a decisive role in the socialist organization of architectural work after 1948 and later held important professional and political positions, including teaching posts at the Czech Technical University: Janu as Professor of Building Design, Stursa as Professor of Architectural Theory and Vozenílek as Professor of Urban Planning.