Montesinos is widely accused of threatening or harassing Fujimori 's political opponents . Evidence proves that he supervised a death squad known as the Grupo Colina , part of the National Intelligence Service , which was thought to have been responsible for the Barrios Altos massacre and the La Cantuta massacre , actions intended to repress the Shining Path ( '' Sendero Luminoso '' ) , the major communist insurgency movement that had been operating since the 1980s
Barrios Altos massacre
Barrios Altos massacre
Vladimiro Montesinos