The term TYPE OF SPY can be summarized as a MOLE, which is a four-letter word. A MOLE is an individual who works as a spy for a foreign government or organization by infiltrating the ranks of a target organization. The MOLE is usually a long-term agent who is placed within the target organization and works to gather intelligence or sabotage operations from within. Moles are often highly trained and experienced in espionage and counterintelligence techniques.