18 U.S.C. § 1734 : US Code - Section 1734: Editorials and other matter as "advertisements"

Search 18 U.S.C. § 1734 : US Code - Section 1734: Editorials and other matter as "advertisements"

Whoever, being an editor or publisher, prints in a publication
entered as second class mail, editorial or other reading matter for
which he has been paid or promised a valuable consideration,
without plainly marking the same "advertisement" shall be fined
under this title.