Guillermo Suárez Mason

He was attached to the Operativo Independencia counterinsurgency mission in 1975, and upon the March 1976 coup against President Isabel Perón, was appointed Commander of the First Army Corps, a unit whose principal duty was to garrison the capital.

Suárez Mason earned a reputation as a hard-line figure in the regime, particularly after steps toward political liberalization began in 1979, and fell out of favor with the president, General Jorge Videla, after the latter's cancellation of Operation Soberanía (the aborted 1978 invasion of neighboring Chile, at the height of the Beagle Conflict).

He oversaw Argentine tactical support for the July 1980 "Cocaine Coup" in Bolivia, and later chaired the Latin American chapter of the World Anti-Communist League.

He was appointed Director of the state oil concern, YPF, by President Leopoldo Galtieri in December 1981, and in 1983, at the end of his tenure, the company recorded a US$6 billion annual loss (the largest in the world at the time).

[4] Pursuant to an Interpol order, however, he was arrested in Foster City, California in January 1987,[6] and on May 9, 1988, extradited to Buenos Aires to face charges of murdering 43 people and kidnapping a further 23, including newborn babies.