The story
CCC was founded in 1978 as a not-for-profit organization in response to negotiations preceding the United States Copyright Act of 1976. The I.R.S. revoked CCC's tax-exempt status in 1982 and the United States Tax Court affirmed that holding, finding that whatever public benefits CCC's activities might produce, its primary purpose was to "further the economic interest of publishers and copyright owners" and its founders (a group of publishers) had no "interests of any substance beyond the creation of a device to protect their copyright ownership and collect license fees". CCC still maintains a state-level not-for-profit status in the State of New York.
From Wikipedia’s article on Copyright Clearance Center, shared under CC BY-SA 4.0.4