“ There are various ways in which the validity of a state statute may be drawn in question on the ground that it is repugnant to the Constitution of the United States. No particular form of words or phrases is essential, but only that the claim of invalidity and the ground therefor be brought to the attention of the state court with fair precision and in due time. ”

“ There can be no doubt that under that power the state may prescribe and apply to associations having an oath-bound membership any reasonable regulation calculated to confine their purposes and activities within limits which are consistent with the rights of others and the public welfare. The requirement in section 53 that each association shall file with the secretary of state a sworn copy of its constitution, oath of membership, etc., with a list of members and officers is such a regulation. ”

“ Criticism is made of the classification on the further ground that the regulation is confined to associations having a membership of 20 or more persons. Classification based on numbers is not necessarily unreasonable. There are many instances in which it has been sustained. We think it not unreasonable in this instance. With good reason the Legislature may have thought that an association of less than 20 persons would have only a negligible influence, and be without the capacity for harm that would make regulation needful. ”