The term 'Thieves' Group' can be described by two crossword solutions: RING (4 letters) and GANG (4 letters). A RING is a group of people who are organized for a common purpose, usually criminal in nature. A GANG is a group of people who are associated with each other through a common identity, typically involving criminal activity. Both terms refer to a group of people who are involved in illegal activities such as theft, robbery, and fraud.