Why is it important for security personnel to understand various behaviors and tactics of terrorist groups? How is information on terrorist groups used to suppress terrorist activity? There are terrorist groups connected with organizations (or governments) and terrorist groups which oppose organizations (or governments). Why is it important to understand both types of terrorism? There are several examples of 'home grown' terrorist groups throughout U.S. history. What common threads run through these groups? Why is it important to recognize and understand these commonalities