Telecommunications companies MCI Communications and WorldCom complete their $37 billion merger to form MCI WorldCom.

MCI Communications Corporation was an American telecommunications company headquartered in Washington, D.C. that was at one point the second-largest long-distance provider in the United States.

MCI, Inc. was a telecommunications company. For a time, it was the second-largest long-distance telephone company in the United States, after AT&T. WorldCom grew largely by acquiring other telecommunications companies, including MCI Communications in 1998, and filed for bankruptcy in 2002 after an accounting scandal, in which several executives, including CEO Bernard Ebbers, were convicted of a scheme to inflate the company's assets. In January 2006, the company, by then renamed MCI, was acquired by Verizon Communications and was later integrated into Verizon Business.