"The main thing in Leninism" is a classic work by V.I. Lenin, who considers the main principles and ideas of Leninism as the theory and practice of Marxism. The book examines in detail such concepts as partisanship, proletarian dictatorship, the victory of socialism and the construction of communism. Lenin highlights the task of the working class in the struggle for the socialist revolution, defines ways to achieve this goal and provides practical advice on organizing the labor movement. This book is an essential part of the library of anyone interested in political theory and the history of the labor movement.