Section 9. In addition to any other remedies provided by law, any violation of sections two to eight, inclusive, which has substantially influenced the action taken by any state agency in any particular matter, shall be grounds for avoiding, rescinding or cancelling the action on such terms as the interests of the commonwealth and innocent third persons require.

The state ethics commission may bring a civil action against any person who has acted to his economic advantage in violation of sections two to eight, inclusive, and may recover on behalf of the commonwealth damages in the amount of the economic advantage or five hundred dollars, whichever is greater. If there has been no final criminal judgment of conviction or acquittal of the same violation, upon receipt of the written approval of the attorney general, the state ethics commission may, in the discretion of the court, so recover additional damages in an amount not exceeding twice the amount of the economic advantage or five hundred dollars, and a judgment for such damages shall bar any criminal prosecution for the same violation.