Sections, acts Feb. 23, 1887, ch. 210, 24 Stat. 409; June 25, 1948, ch. 646, §§ 5, 39, 62 Stat. 986, 992, prohibited importation of opium by Chinese subjects and the trafficking in, in China, of opium by United States citizens. Sections 1 to 3 of said Act of Feb. 23, 1887, were classified to sections 191 to 193, respectively, of this title.