An association may be organized to engage in any activity in connection with the production, marketing or selling of the agricultural products of its members, or with the harvesting, preserving, drying, processing, canning, packing, storing, handling, shipping or utilization thereof, or the manufacturing or marketing of the by-products thereof; or in connection with the purchasing, manufacturing, selling or supplying to its members of machinery, equipment or supplies; or in the financing of the above enumerated activities; or in any one or more of the activities specified herein.