Melville Fuller,
Ambrosini v. United States — Opinion of the Court
“ To tax the license would be to impair the efficiency of state and municipal action on the subject and assumes the power to suppress such action. And considering license and bond together, taxation of the bond involves the same consequences. In themselves the bonds were not mere incidents of the regulation of the traffic, but essential safeguards against its evils, and governmental instrumentalities of state and of city, as authorized by the state, to insure the public welfare in the conduct of the business, although the business itself was not governmental. ”
