Stephen Johnson Field,
Cummings v. Missouri — Opinion of the Court
“ It is not a new or additional penalty or forfeiture for the crime of treason. It was not so intended. In its true purpose, such an act is not a criminal law at all, much less an ex post facto law. It is an act to fix the qualifications of voters, and applies to the innocent as well as to the guilty. If a man, having long enjoyed the franchise, be excluded by the sovereign act of the people, unless he will take an oath that he can read and write, is it to be construed an act to punish ignorance, or an act to preserve the purity and usefulness of the ballot-box? ”
