In any action brought under this chapter, where persons are employed or performing services for any person or in the conduct of the business wherein such person is charged with a violation of this chapter, and are so employed or performing such services without compensation or at a wage lower than that prevailling at the time and place of the service for the particular services performed, such services shall be charged as an expense of the business in which rendered and at the rate of the wage for the services rendered prevailing at the time of the service at the place where rendered.