Vladimir Mikhailovich Bekhterev is a Russian neurologist, psychiatrist and psychologist, founder of a scientific school, author of fundamental works on anatomy, physiology and pathology of the nervous system, founder of social psychology in Russia and creator of the first Psychoneurological Institute in Russia. The book reveals the essence of suggestion as a mental phenomena, mechanisms of occurrence of mental epidemics and the role of various types of suggestion in their origin and spread during crisis situations in societies. This was the first experience of this kind in domestic science.