The book “Proletarians of all countries, unite” by User is not just a historical or political work, but a real guide to the era of revolutionary changes that forever changed the face of the world. The focus of this work is a powerful and inspiring message about the unity of the working class, its struggle for liberation and the building of a new society. The title, referring to the famous slogan of the Marxist revolution, in this case acquires special relevance and depth, revealing to the reader the wealth of ideas inherent in the classical theory of Marxism-Leninism. The author, known under the pseudonym User, masterfully immerses the reader in the historical context of the creation and development of the book, which has become a symbol of the struggle for social justice. This work traces not only the theoretical basis, but also the practical embodiment of the ideas that inspired millions of people around the world to fight for their rights. Particular attention is paid to the role of the Marx-Engels-Lenin Institute under the Central Committee of the All-Union Communist Party (Bolsheviks), which became the center of the formation and dissemination of revolutionary thought, as well as an important link in the implementation of the ideas of communism. The book "Proletarians of all countries, unite" is intended for a wide range of readers who are interested in history, politics, ideas of socialism and communism. It is especially relevant for students, historians, political scientists and active citizens seeking a deep understanding of the processes that led to the revolutionary transformations in the 20th century. It can also become a reference book for those who want to understand how the ideas of Marxism and Leninism continue to influence modernity and what lessons can be learned from the past. The author masterfully raises important topics - from the class struggle and the role of the proletariat to the issues of ideology, strategy and tactics of the revolutionary movement. In its presentation, there is a special style - a combination of academic rigor with a lively, emotional narrative, which makes reading not only informative, but also exciting. The work is full of quotations, historical facts and analytical reflections, which allows the reader not only to understand the theory, but also to feel the spirit of the era when the ideas of socialism became a reality. The peculiarity of the book is its ability to combine theoretical foundations with practical aspects of revolutionary activity, as well as to show how the ideas inherent in the works of Marx, Engels and Lenin were embodied in concrete historical events. The author is not limited to dry academic presentation, but creates a vivid picture of the struggle of the proletariat, its hopes and trials, which makes the book especially valuable for those who seek not only knowledge, but also inspiration. If you are interested in the history of the Soviet state, the ideas of Marxism-Leninism or want to understand how the foundations of the modern socialist movement were formed, this book will be a real discovery for you. It is suitable for readers aged 16 and older who appreciate deep analysis, historical truth and ideas that can change the world. It will resonate with those who seek to understand the meaning of the struggle for equality and justice, as well as those who want to expand their knowledge of key figures and events of the 20th century. “Proletarians of all countries, unite” is not just a book, it is a challenge, a reminder and an inspiration for all who believe in the power of the single working class and its ability to change the world. It reveals the themes of class struggle, revolutionary strategy, the role of leaders and ideology, which makes it relevant today. The work deservedly occupies a place in the libraries of those who value historical truth, the ideas of socialism and strive to understand the mechanisms of social transformation. This is a book that will not leave indifferent any reader looking for answers to the most important questions of our time.