I think its definatley Albert Fish. He killed a 10 year old girl, ate her, then sent a note to her parnets telling them how "tasty" she was. He also put 26 sewing needles through his crotch for sexual gratification.

I think it is the son of sam in 1977 he had new york in fear.

I'd have to go with either Jeffery Dahmer or The Nightstalker, Richard Ramirez. The most prolific serial killer of all time was Harold Shipman. The Shipman Inquiry concluded that the family doctor murdered 215 of his patients between 1975 and 1988. He killed his elderly (mostly female) victims with the administration of drugs.

Sam "Mad Sam" DeStefano was probably one of the sickest torturer / murderer in the Mob world. He liked to torture his victims and made sure they would die a very slow and painful death. I've heard one of his victims even had a smile on his face when he died because he couldn't take the pain any longer.

Ted Bundy. And there was another killer who said he enjoyed raping women and getting them pregnated before finishing them off.