OPINION — AG — EMPLOYEES IN THE CLASSIFIED SERVICE MAY NOT PROPERLY SIGN A REFERENDUM PETITION OR OTHERWISE PARTICIPATE IN ACTIVITY SUPPORTING OR OPPOSING SAME. CITE: 74 O.S. 1961 818 [74-818], OPINION NO. SEPTEMBER 13, 1960 (BURCK BAILEY) *** OVERRULED BY: OPINION NO. 67-155 (1967)