The Monopolies and Mergers Commission.
A former UK governmental organization which investigated uncompetitive trading practices, and potential violations of the 1973 Fair Trading Act and 1990 Competition Act.
The MMC started life as the Monopolies and Restrictive Practices Commission in 1948, and was replaced by the Competition Commission on 1st April 1999.
Sources: http://www.xrefer.com and http://www.competition-commission.gov.uk