The term "criminal leader" can be replaced with several synonyms. One of them is "kingpin," which is often used to describe the top leader of a criminal organization. Another synonym is "boss," which is commonly used to refer to the head of a criminal enterprise. The term "godfather" also refers to someone who is the head of a criminal organization. "Don" can be used to describe the leader of a mafia group or organized crime syndicate. "Rebel leader" can also be considered a synonym for a criminal leader, who leads a group that is fighting against a government or established authority. Other synonyms include "gang leader," "crime boss," "outlaw leader," and "ringleader.