惩一儆百

Explanation: Punish: punishment; Police: alert. Killed a person in order to alert many people. 　　Usage: -Linked; as predicate; intended as a warning to 　　Source: Han Ban Gu, "Han Yin Chuan Weng return": "to a warning, Answer to all services, fear diverted to themselves." 　　Examples: Brothers set to ~ today, let everyone see face to face, so that they have a fear of fear. (Qing Li Baojia "Bureaucrats" 56th back) Thesaurus:  J a warning, to punish one person as a warning to a hundred others