He was alleged to have served the junta by participating directly in its Dirty War against political opponents, dissidents, and activists, under the name Miguel Angel Cavallo and pseudonym "Serpico." He served with the G322 secret operations.
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Under the name Miguel Angel Cavallo and pseudonym "Serpico", he served as an officer of the National Reorganization Process (El Proceso), the military junta that ruled Argentina from 1976 to 1983.
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