A person in the employ of or holding any official relation to any company subject to the supervision of the Commission, or engaged in the management of such company, or owning stock, bonds, or other securities thereof, or who is, in any manner, connected with the operation of such company in this State, shall not be a member or clerk of the Commission or Commissioner of Public Service; nor shall any person holding the office of member, clerk of the Commission, or Commissioner of Public Service personally or in connection with a partner or agent, render professional service for or against or make or perform any business contract with any company subject to such supervision, relating to the business of such company, except contracts made with them as common carriers or in regular course of public service; nor shall such person, directly or indirectly, receive from any such company any commission, present, or reward. (Amended 1959, No. 329 (Adj. Sess.), § 39(b), eff. March 1, 1961; 1979, No. 204 (Adj. Sess.), § 4, eff. Feb. 1, 1981.)