A Massachusetts consulting firm announced Friday that it will retroactively register its work for Moammar Gadhafi and Libya with the Department of Justice after an internal investigation concluded it had sidestepped federal laws that require companies to disclose work done on behalf of foreign governments.

The Cambridge-based Monitor Group, a global management consulting firm that employs prominent Harvard professors, has faced public scrutiny for its engagement with the longtime Libyan leader from 2006 to 2008. According to leaked memos between the group and Gadhafi representatives, the Monitor Group would “introduce” Gadhafi as an intellectual to the international community and create a dialogue between the now-embattled leader and prominent figures in the United States.

“Monitor supported, during a period of genuine promise, the processes of reform and modernization in Libya,” Managing Partner Stephen M. Jennings said in a statement. “We made some mistakes along the way. … We have been resolute in our determination to find the facts, remedy errors, and ensure that we learn from them.”

Monitor Group co-founder and chief executive Mark Fuller announced earlier this week that he was resigning from all of his roles at the firm.

The resignation and statement occurred after an internal investigation of Monitor’s work in Libya done by the Washington, D.C., law firm Covington & Burling revealed that the consulting firm should have registered under the Foreign Agents Registration Act, a World War II era law that requires the disclosure of work done on behalf of foreign powers. More recent work done on behalf of the country of Jordan will also be filed with the Justice Department, the company said.

Though those who fail to register or properly disclose work done on behalf of interests abroad can face fines of up to $10,000 or six years in prison, criminal prosecutions are rare. The Justice Department’s FARA Unit typically seeks to obtain voluntary compliance with the statute.