Army supplies. Prohibition of exportation of munitions of war, hearing on S. 6688, to prohibit individuals, partnerships, or corporations in the United States from selling arms, ammunition, artillery, and explosives of any kind for exportation during existence of war except upon proof that said arms, ammunition, artillery, and explosives are not to be used in said war against country with which United States is at peace, and S. 6862, to forbid furnishing of war materials to belligerent nations.