An extensive review of sociological and psychiatric studies is presented, and the vital importance of predicting violent behavior in view of statistical data concerning rampant violent crime in the United States is stressed. More cooperation between psychiatric experts and the judicial systems is warranted in view of the common social problems encountered and the need for better diagnostic procedures and more logical deductive factual expert reports. Sociological and environmental, psychological, biological, and neurophysiological factors need to be considered when assessing the potential dangerousness of an individual. The hypothesis is presented that prediction is strictly connected with the possible prevention of violent behavior and the continuation of a civilized secure society. 67 references (Author abstract modified)