Leonarda Cianciulli was an Italian serial killer who murdered three women and turned their bodies into soaps and tea cakes. She is also known as the "Soap-Maker of Correggio." Between 1939 and 1940, she killed three of her neighbors--all of them middle-aged women--as part of human sacrifices. She was eventually found guilty of her crimes and sentenced to prison.
Known as the Chessboard Killer, Alexander Pichushkin set out to kill people matching all the 64 squares on his chessboard, and would cross out a square with every kill. Mostly targeting elderly people, he managed to kill about 48 to 60 people and was eventually sentenced to life imprisonment.