Felix Frankfurter,
Toucey v. New York Life Insurance Company Phoenix Finance Corporation…
“ But when the preliminary question is the meaning and application of the federal decree as a basis for a conclusion as to whether or not the decree shall be enforced by further steps, it is entirely a federal question. It is immaterial from that point of view whether the federal jurisdiction was bottomed originally on diversity, or the Constitution or laws of the United States. The power to give effect to the judgments of federal courts rests with Congress. ”
