Ver Cuevana2. Julio César Arana, a rubber baron in the Putumayo region, who was characterized by being a callous, heartless, and debased personality, allies himself with foreign companies, to exploit rubber reserves in the Peruvian Amazon region. He stops at nothing, not even the extermination of indigenous tribes. Thus, the so-called crimes of Putumayo occur; the Amazonian communities rebel and resist.