The case that came to mind is the one in the law journal I linked to earlier.
Voyager 1000 v. CAB, 489 F.2d 792 (7th Cir. 1973), cert denied, 42 U.S.L.W. 3626 (U.S. May 13, 1974) (No.1033)
What the court held in this case, then, is that it took nothing to become a member of Voyager. It takes...