Stanley Matthews, Allen v. Baltimore Railroad Company…
“ Where the rights in jeopardy are those of private citizens, and are of those classes which the constitution of the United States either confers or has taken under its protection, and no adequate remedy for their enforcement is provided by the forms and proceedings purely legal, the same necessity invokes and justifies, in cases to which its remedies can be applied, that jurisdiction in equity vested by the constitution of the United States, and which cannot be affected by the legislation of the states. ”
