The papers given by the Soviet Delegation to the Second International Congress of the History of Science and Technology in London in 1931, headed by N. I. Bukharin, exerted a profound influence on Western historiography of science. Perhaps the most influential contribution was that of Hessen, who made a long and classical statement of Marxist historiography, taking Isaac Newton as his example. The collection, which appeared in Britain at the height of the Depression, fostered an acute social awareness and a heated debate among many working scientists. Accredited by some as ‘the starting point of a new evaluation of the history of science’, the book reflects the huge social and economic divide between Socialism and Capitalism present at the time of publication, and its influence on intellectual culture and scientific advancement.