The photographs - some of them shown here - were taken by Siberians Vladimir Vorobyev, Vladimir Sokolayev and Alexander Trofimov who worked in the late 1970s - the era of Soviert leader Leonid Brezhnev - Novokuznetsk Metallurgy Plant. 

The trio called their group TRIVA, and while they had no written manifesto for their work, they had a definite aim: it was one that the authorities found it hard to cope with.