Who are the "Interrogators" in the novel, Hades, Argentina?

While working as an assistant in the interrogation center, Tomás worked under the direction of several interrogators. These interrogators were all men, and they all appeared to be quite sadistic. They tortured and killed prisoners, and they often raped female prisoners. After beginning to suspect that Tomás was indirectly involved in the priest’s murder, they tortured Tomás.