Whenever any handler has engaged or there are reasonable grounds to believe that any handler is about to engage in any act or practice prohibited by section 2303 of this title, a civil action for preventive relief, including an application for a permanent or temporary injunction, restraining order, or other order, may be instituted by the person aggrieved. In any action commenced pursuant hereto, the court, in its discretion, may allow the prevailing party a reasonable attorney’s fee as part of the costs. The court may provide that no restraining order or preliminary injunction shall issue except upon the giving of security by the applicant, in such sum as the court deems proper, for the payment of such costs and damages as may be incurred or suffered by any party who is found to have been wrongfully enjoined or restrained.