California Code, Business and Professions Code - BPC § 6151

(a) A runner or capper is any person, firm, association or corporation acting for consideration in any manner or in any capacity as an agent for an attorney at law or law firm, whether the attorney or any member of the law firm is admitted in California or any other jurisdiction, in the solicitation or procurement of business for the attorney at law or law firm as provided in this article.

(b) An agent is one who represents another in dealings with one or more third persons.