requiring "some meeting of minds in an unlawful arrangement" for charge of conspiracy to commit tax fraud

In Sunshine Book Co. v. Summerfield, 355 U.S. 372, the court granted certiorari to review the judgment of the Court of Appeals that nudist magazines for general distribution which contained pictures of naked men, women and children accompanying textual matter which the Post Office Department had found not to be obscene and which advocated and explained nudism could be found to be obscene because of the pictures, so that the magazines could lawfully be barred from the mails.