The most horrible maniacs in history

Maniac killer: psychology and classification. Do you know that maniacs are completely different? For example, local (their victims in certain areas), wandering (hunting in travel), power lovers (superiority over the victim), sweethearts (hedonists), visionaries (schizophrenics), missionaries («judges» or «cleaners»). Want to learn more about «organized» (calculated), disorganized (impulsive), mass, or «chain» serial killers?