“ Appellants, civil rights workers, were arrested on charges of grand larceny. Together with other persons who are not parties to this appeal, the appellants were plaintiffs in this suit before a three-judge court. The complaint charged that Negroes had been systematically excluded from the grand and petit juries in Greene County and that the all-white county jury commission was unconstitutionally constituted. ”

“ In these circumstances the court could properly conclude that this was not one of 'those exceptional cases which call for the interposition of a court of equity to prevent irreparable injury which is clear and imminent.' Douglas v. ”