Some thirty years later Congress passed the first of a series of acts to exclude from the mails publications designed to defraud the public or corrupt its morals. In the pioneer case of Ex parte Jackson,[1140] the Court sustained the exclusion of circulars relating to lotteries on the general ground that "the right to designate what shall be carried necessarily involves the right to determine what shall be excluded."[1141] The leading fraud order case, decided in 1904, holds to the same effect.[1142] Pointing out that it is "an indispensable adjunct to a civil government," to supply postal facilities, the Court restated its premise that the "legislative body in thus establishing a postal service, may annex such conditions to it as it chooses."[1143] Later cases appear to have qualified these sweeping declarations. In upholding requirements that publishers of newspapers and periodicals seeking second-class mailing privileges file complete information regarding ownership, indebtedness and circulation and that all paid advertisements in such publications be marked as such, the Court emphasized that these provisions were reasonably designed to safeguard the second-class privilege from exploitation by mere advertising publications. Chief Justice White warned that the Court by no means intended to imply that it endorsed the government's "broad contentions concerning the existence of arbitrary power through the classification of the mails, or by way of condition * * *"[1144] Again, in Milwaukee Social Democratic Publishing Co. _v._ Burleson,[1145] where the Court sustained an order of the Postmaster General excluding from the second-class privilege a newspaper which he found to have systematically published matter banned by the Espionage Act of 1917, the claim of absolute power in Congress to withhold this privilege was sedulously avoided. More recently, when reversing an order denying the second-class privilege to a mailable publication because of the poor taste and vulgarity of its contents, on the ground that the Postmaster General exceeding his statutory authority, Justice Douglas assumed, in the opinion of the Court, "that Congress has a broad power of classification and need not open second-class mail to publications of all types."[1146] THE EXCLUSION POWER AS AN ADJUNCT TO OTHER POWERS