2015 US Code
Title 22 - Foreign Relations and Intercourse (Sections 1 - 9141)
Chapter 9 - Foreign Wars, War Materials, and Neutrality (Sections 401 - 465)
Subchapter I - War Materials (Sections 401 - 423)
Sec. 406 - Interference with foreign trade

Except in those cases in which the exportation of arms and munitions of war or other articles is forbidden by proclamation or otherwise by the President, as provided in section 401 of this title, nothing herein contained shall be construed to extend to, or interfere with any trade in such commodities, conducted with any foreign port or place wheresoever, or with any other trade which might have been lawfully carried on before June 15, 1917, under the law of nations, or under the treaties or conventions entered into by the United States, or under the laws thereof.

(June 15, 1917, ch. 30, title VI, §6, 40 Stat. 225.)

Herein, referred to in text, means act June 15, 1917, ch. 30, title VI, 40 Stat. 223, as amended, which enacted sections 31 to 39, 98, 130 to 133, 288, 343 to 346, 381, 502, 535, 536, 574, and 611 to 633 of former Title 18, Criminal Code and Criminal Procedure, sections 213, 231 to 233, 235, 401 to 408a, 462, and 465 of this title, and sections 30 to 42, 191, and 192 to 195 of Title 50, War and National Defense, and amended sections 25, 27, and 349 of former Title 18. For complete classification of this Act to the Code, see Tables.