Does evil reside within the individual? Or is it a force which can be as powerful when applied to more than one person, as in a couple, a gang, or even an army? For cases involving more than one individual, the fact that neither found the other’s deeds reprehensible enough to report or question is enough to make anyone wonder about the true nature of evil. In any case, the individuals profiled in the infographic below all showed the same amount of hatred and sadism by torturing their victims and showing no compassion or remorse.