An official DoD report 'The Expanding Spectrum of Espionage by Americans, 1947–2015', which is the report is the fourth in the series on espionage by Americans that the Defense Personnel and Security Research Center (PERSEREC) began publishing in 1992 and published in August 2017, but appeared on my Twitter feed today.
Link:https://publicintelligence.net/perse...-by-americans/
The publishers explain, so not the DoD:The introduction has some gems:The report describes characteristics of 209 Americans who committed espionage-related offenses against the U.S. since 1947. Three cohorts are compared based on when the individual began espionage: 1947-1979, 1980-1989, and 1990-2015. Using data coded from open published sources, analyses are reported on personal attributes of persons across the three cohorts, the employment and levels of clearance, how they committed espionage, the consequences they suffered, and their motivations. The second part of the report explores each of the five types of espionage committed by the 209 persons under study. These include: classic espionage, leaks, acting as an agent of a foreign government, violations of export control laws, and economic espionage.Three-quarters succeeded in passing information, while one-quarter were intercepted before they could pass anything. Sixty percent were volunteers and 40% were recruited. Among recruits, 60%were recruited by a foreign intelligence service and 40% by family or friends.Contacting a foreign embassy was the most common way to begin as a volunteer.
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