(a) Nothing contained in this chapter shall be construed to forbid the existence or operation of labor, agricultural, or horticultural organizations instituted for the purpose of mutual help, and not having capital stock and not conducted for profit, or to forbid or restrain individual members of such organizations from lawfully carrying out the legitimate objects thereof. Such organizations, or the members thereof, shall not be held or construed to be illegal combinations or conspiracies or monopolies in restraint of trade, under the provisions of this chapter.

(b) Nothing contained in this chapter shall apply to those activities of any person when said activity is specifically directed or required by a statute of this state, or of the United States.

(c) Nothing contained in this chapter shall be construed to prevent persons engaged in the production of agricultural products as farmers, planters, dairymen or growers from acting together in associations, corporate or otherwise, with or without capital stock, in collectively processing, preparing for market, handling and marketing in interstate and foreign commerce, such products of persons so engaged. Such associations may have marketing agencies in common; and such associations and their members may make the necessary contracts and agreements to effect such purposes; provided, such associations are operated for the mutual benefit of the members thereof, as such producers, and conform to one or both of the following requirements: (i) That no member of the association is allowed more than one vote because of the amount of stock or membership capital he may own therein, or, (ii) that the association does not pay dividends on stock or membership capital in excess of eight per cent per annum, and, (iii) that the association shall not deal in the products of nonmembers to an amount greater in value than such as are handled by it for members.