Blackmailer

['blækmelɚ]

(noun.) a criminal who extorts money from someone by threatening to expose embarrassing information about them.

Typed by Essie--From WordNet

(n.) One who extorts, or endeavors to extort, money, by black mailing.

Typist: Willard

And who is the blackmailer? Arthur Conan Doyle. The Memoirs of Sherlock Holmes.
He is the king of all the blackmailers. Arthur Conan Doyle. The Return of Sherlock Holmes.

Typed by Konrad