extortion, in law, unlawful demanding or receiving by an officer, in his official capacity, of any property or money not legally due to him. Examples include requesting and accepting fees in excess of those allowed to him by statute or arresting a person and, with corrupt motives, demanding money or property unlawfully under pretense of duty. The taking of money or property is generally an essential element of the crime. In most states of the United States, extortion is more widely defined to include the obtaining of money or property of another by inducing his consent through wrongful use of fear, force, or authority of office; blackmail, ransom, and threat of force are included under this definition.
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