Collection of publications, texts of speeches and interviews, letters and telegrams. The fifth edition[edit] - M. : Politizdat, 1963 - 620 s. : il. In the full collection of works in . and . Lenin includes his books, as well as articles and interviews published in various organs of the Russian and foreign press; reports and speeches by B. and . Lenin at party congresses, conferences, congresses of the Soviets, congresses of the Comintern, speeches at meetings of the leading centers of the party, at mass meetings and rallies; leaflets, statements, addresses, program documents, draft resolutions, decrees, greetings, the author of which was V. and . Lenin, letters, telegrams, notes, recordings of conversations over a direct wire, questionnaires and other materials. The sixth volume of the Collected Works includes the book What to Do? The Painful Questions of Our Movement (Autumn 1901 - February 1902) and works written in January - August 1902. During these years, the struggle of Lenin's Iskra against "economism" became extremely important. the main brake on the working-class and social-democratic movement in Russia , for the ideological and organizational unity of the revolutionary Marxist elements of Russian Social-Democracy , for the creation of a new type of party, Opportunism , free of circling and fractionality, political leader of the working class , organizer and leader of the revolutionary struggle against autocracy and capitalism . In the book What Is To Be Done? Lenin substantiated and developed the ideas of K. in relation to the new historical situation. Marx and F. Engels on the Party as the revolutionary, leading and organizing force of the working-class movement, developed the foundations of the doctrine of the party of a new type, the party of the proletarian revolution. In this work of revolutionary Marxism, the Russian Social-Democrats found answers to the questions that concerned them. On the correlation of the conscious and spontaneous elements of the working-class movement, on the Party as the political leader of the proletariat, on the role of Russian Social-Democracy in the brewing bourgeois-democratic revolution, on the organizational forms, ways and methods of creating a militant revolutionary proletarian party The book "What to do?" completed the ideological defeat of "economism", which Lenin considered as a kind of international opportunism (Bernsteinianism) on Russian soil.