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The Directorate of Territorial Security, which developed after World War II, and succeeded by the General Directorate for Internal Security (DGSI or initially the DCRI; since 2008) has led France's internal spying and anti-terrorism efforts within France. The DGSI also merged aspects of the General Intelligence Directorate, which also had responsibilities for internal security, although it was an arm more for the police and focused on efforts such as narcotics. French internal espionage often concentrated on networks within France trying to steal technology. However, a notable success came in 1981, when the notable Soviet KGB spy Vladimir Vetrov switched sides and gave France thousands of documents that helped it uncover KGB officers stationed worldwide. It was one of the greatest successes for France in the Cold War and one of the largest successes for NATO allies in counter-espionage. However, the DGSI also participated in internal espionage. Once its agents were caught posing as plumbers in France as they were trying to install listening devices in a newspaper critical of the government. This led to the downfall of the interior minister.<ref>For more on the DGSI and its equivalents in post-World War II France, see: Derdzinski, J.L. (2009)<i> Internal security services in liberalizing states: transitions, turmoil, and (in)security</i>. Farnham, England ; Burlington, VT, Ashgate Publishing Co, pg. 57.</ref>

==Summary==