Roots of Aggression By Leonard Berkowitz

Roots of Aggression: A Re-examination of the Frustration-Aggression Hypothesis" is a seminal psychological work written by the prominent American social psychologist Leonard Berkowitz. Published originally in 1962 (and later expanded in his 1993 volume, Aggression: Its Causes, Consequences, and Control), the text serves as a major turning point in how behavioral scientists understand what drives human violence and anger. 

Berkowitz uses the famous 1939 "Frustration-Aggression Hypothesis" by Dollard and his Yale colleagues as his starting point. While the original Yale theory claimed that frustration always automatically leads to some form of aggression, Berkowitz heavily updated this idea based on fresh laboratory data