The book "History of Socialism. Predecessors of Modern Socialism. From Plato to the Anabaptists. Volume 1" was written by Karl Kautsky, an outstanding German political figure and historian of socialism. In this work, the author examines the origin and development of socialist ideas, starting from antiquity and ending with the late Middle Ages. Kautsky examines in detail the opinions of famous thinkers who influenced the formation of the socialist concept, from Plato to the Anabaptists, along with other important philosophers and theorists. This book is a valuable source for understanding the history and development of the socialist movement, and also reflects the deep knowledge and analytical skills of the author himself.