County of Allegheny v. Frank Mashuda Co.

Mr.. Justice Brennan

delivered the opinion of the Court.

■This case presents the question whether a District Court may abstain from exercising its properly invoked diver-' *187sity jurisdiction in a state eminent domain case in which the exercise of that jurisdiction would not entail the possibility of a premature and perhaps unnecessary decision of a serious federal constitutional question, would not create the hazard of. unsettling some delicate balance in the area of federal-state relationships, and would not even require the District Court to guess at the resolution of uncertain and difficult…