Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Ben Shepperd, regarding a legal question submitted for clarification: Applicability of the non-communist oath required by H.B. 21, 53rd Legislature, to services by doctors, lawyers, engineers, architects, skilled services, labor, statutory witness fees in criminal cases, payment of expert witnesses, payment for assistance in law enforcement, cooperative projects administered by other agencies, constitutional salaries of State Officers and per diem of members of the Legislature.