If you order a person to shock another for incorrect answers, then he will follow the order until he kills. If you offer a person to become a guard in a prison where his classmates are kept, then on the first day he will do everything possible to avoid the need to show cruelty, but only on the first day, and then the experiment will have to be stopped due to cases of uncontrolled aggression on the part of a group of guards. What does authority mean to a person? What lengths is he willing to go to for the sake of public approval? What crimes can be committed under orders, and what line will a healthy person never cross? Is there such a trait at all? You will find answers to these questions in the book by two of the best social psychologists of the 20th century.