I can see no basis for concluding that the liberty of a corporation to engage in political activity with regard to matters having no material effect on its business is necessarily incidental to the purposes for which the Commonwealth permitted these corporations to be organized or admitted within its boundaries. Nor can I disagree with the Supreme Judicial Court's factual finding that no such effect has been shown by these appellants. Because the statute as construed provides at least as much protection as the Fourteenth Amendment requires, I believe it is constitutionally valid.