The theoretical perspective known as "anarquismo sin adjetivos" was one of the by-products of an intense debate within the movement of anarchism itself. The roots of the argument can be found in the development of anarcho-communism after Mikhail Bakunin's death in 1876. While not entirely dissimilar to collectivist anarchism (as can be seen from James Guillaume's famous work "On Building the New Social Order" within Bakunin on anarchism, the collectivists did see their economic system evolving into free communism), communist anarchists developed, deepened and enriched Bakunin's work just as Bakunin had developed, deepened and enriched PIerre-Joseph Proudhon's. Communist anarchism was associated with such anarchists as Élisée Reclus, Carlo Cafiero, Errico Malatesta and (most famously) Peter Kropotkin.