The last paragraph of section 49 of title 15, and the provisions of section 409(l) of title 47, referred to in text, which related to immunity of witnesses, were repealed by sections 211 and 242, respectively, of Pub. L. 91–452, Oct. 15, 1970, title II, 84 Stat. 929, 930. For provisions relating to immunity of witnesses, see section 6001 et seq. of Title 18, Crimes and Criminal Procedure.