The correct answer is the following.
The correct matches are:
Organization of Petroleum Exporting Countries; Cartel.
Lockheed Martin Corporation: Government contractor.
The antitrust division of the Department of Justice: competition regulator.
The Organization of Petroleum Exporting Countries is a Cartel. Better known as OPEC, this cartel was founded in Baghdad in 1960 and is compounded of 14 countries. Founding members are Iran, Saudi Arabia, Iran, Venezuela, and Kuwait.
Lockheed Martin Corporation is a government contractor. It was founded by Glen L Martin in 1912, as a company that built airplanes in Los Angeles. It merged with Martin Marieta in 1995 to became a leader in aerospace and defense technology company with its headquarters in Maryland.
The antitrust division of the Department of Justice: competition regulator. This division ensures fair competition among companies in the market. Its function is to be vigilant in order to avoid or impede monopolies in the market.