Extortioner

例句：

1. 1.The police are investigating the case of a recent extortion attempt.
   警方正在调查一起近期的勒索企图案件。
2. 2. The extortioner threatened to harm the victim if they did not pay up.
   勒索者威胁说，如果不付钱，就要伤害受害者。
3. 3.He was arrested for extortion after being caught trying to blackmail a businessman.
   他被逮捕是因为试图敲诈一位商人而被抓获。