An analysis of the basic features of America's democratic society emphasizes that these features make it possible for a terrorist group to work here without immediate detection. A discussion of the prevention of chemical and biological warfare focuses on the problem of preventing terrorism without destroying individual freedoms. An analysis of executive protection distinguishes between terrorists, who act within a structured and organized framework, and 'crazies,' who are usually loners. It outlines specific techniques for avoiding attacks from each type of attacker. A discussion of aviation terrorism emphasizes the steps that airlines and airports should take to protect but not constrain air travel in the United States. Summary of statistics on domestic and international terrorism during 1985.