Section 721. Unlawful to Act as Agent or to Employ Agents Without Registration.--It shall be unlawful for a distillery certificate broker to employ any person to act as agent, or for any person to act as agent for any distillery certificate broker, in purchasing, exchanging, offering for sale, delivering, entering into agreements for the purchase, sale, exchange, soliciting subscriptions to, orders for, undertaking to dispose of, dealing in any manner in, distillery bonded warehouse certificates, without such person first having been registered as an agent as provided in this article.