MCI

MCI, Inc., a former telecommunications giant, now operates as a subsidiary of Verizon Communications since January 2006. Originally known as WorldCom, the company was once the second-largest long-distance telephone provider in the U.S. MCI grew by acquiring other telecom companies, including MCI Communications in 1998.

MCI's impact was significant in the telecom industry, but it faced a major setback with a 2002 accounting scandal leading to bankruptcy. Despite this, the company played a crucial role in shaping the telecom landscape before becoming part of Verizon.