ABSTRACT
As damaging as attacks from threats outside your organization may be, an attack by a person who works for you and who has designed the very systems that keep you safe is far more ominous. Some of the most significant and notorious figures in American history have caused insider threats. These individuals include Benedict Arnold in the Revolutionary War; Tokyo Rose in World War II; Julius Rosenberg, who sold the atomic bomb to the Soviet Union; Robert Hanssen, the Federal Bureau of Investigation (FBI) agent who spied for the Soviet Union; John Walker Jr., the U.S. Navy communications officer who spied for the Soviet Union; and Aldrich Ames, the Central Intelligence Agency (CIA) analyst who also spied for the Soviet Union. Today, these figures include Nidal Malik Hasan, the U.S. Army major who murdered 13 people at Fort Hood, Killeen, Texas; and Adam Yahiye Gadahn, also known as Azzam the American, who worked for Al Qaeda. Ames, Hasan, Walker, and Hanssen were trusted U.S. government employees; all had high-level U.S. government clearances, and all of them spied for the Soviet Union.
