 Although he derided Marxists who adopted ideas from contemporary non-Marxist philosophers and sociologists, his own ideas were influenced not only by Russian Marxist theory but also by wider ideas from the Russian revolutionary movement, including those of the Narodnik agrarian-socialists.He adapted his ideas according to changing circumstances, including the pragmatic realities of governing Russia amid war, famine, and economic collapse.Thus, as Leninism developed, Lenin revised the established Marxist orthodoxy and introduced innovations in Marxist thought.