In 1964 he published The Anarchists, which showed his intertwined interests in the culture, events, political philosophy, and individual personalities forming the history of a Leftist movement.
During the Spanish Civil War of 1936–1939, although the anarchists and Marxists both fought in a united front against the fascist movement of General Francisco Franco, the revolutionary Marxists of the Workers' Party of Marxist Unification (POUM), the anarcho-syndicalists of the Confederación Nacional del Trabajo (CNT), and the anarchists of the Federación Anarquista Ibérica (FAI) faced repression and attacks from the Communist party.
Gus and the Anarchists is a 1915 American silent comedy film featuring Oliver Hardy.
The task given to Lafargue consisted mainly of gathering a Marxist leadership in Madrid, while exercising an ideological influence through unsigned articles in the newspaper La Emancipación (where he defended the need to create a political party of the working class, one of the main topics opposed by the anarchists).