This document discusses several Russian constructivist artists and architects active in the early 20th century such as El Lissitzky, Vladimir Tatlin, and Konstantin Melnikov. It provides information on key artworks and buildings from this period including Tatlin's Monument to the 3rd International, Lissitzky's Proun paintings, and Melnikov's Soviet Pavilion at the 1925 Paris expo. The document also mentions other constructivist designs for buildings in Moscow from the 1920s-1930s.