put in. evidence. Mr. Justice Field, speaking for himself and Judge Sawyer, said (p. 560):
“ The statements of supervisors, in debate on the passage of the ordinance cannot, it is true, be resorted to for the purpose of explaining the meaning of the terms used; but they can be resorted to for the purpose of ascertaining the general object of the legislation proposed, and the mischiefs sought to be remedied.”
While it is impossible from the -terms of the act itself, and in the light of the foregoing circumstances leading up to its passage, reasonably to conclude that Congress intended to vest the Commission with the general power to prevent all sorts of \infair trade practices in commerce apart from their actual or potential effect upon the trade of competitors, it is not necessary that the facts point to any particular trader or traders. It is enough that there be present or potential substantial competition, which is shown by proof, or appears by necessary inference, to have been injured, or to be clearly threatened with injury, to a substantial extent, by the use of the unfair methods complained of.
In Federal Trade Comm. v. Winsted Co., 258 U. S. 483, it appeared that a manufacturer engaged in selling underwear and other knit goods made partly of wool, labeled them as “ natural merino,” “ natural wool,” “Australian wool,” etc. It was shown that a substantial part of the consuming public and some buyers and retailers understood the words used in the labels to mean that the underwear was all wool. Part of the public was thereby misled into selling or into buying, as all wool, underwear which was in large part cotton. The labels were false and calculated to deceive, and did in fact deceive, a substantial portion of the purchasing public. This court, after saying that the facts show that a proceeding to stop the practice was in the interest of the public, added (page 493) :