What is the effect of reducing the number of prospective jurors in criminal cases?

Modifying slightly the language of Mr. Justice Marshall in his court opinion for three members of the court in the very recent case of Peters v. Kiff (1972) 407 U.S. 493, 92 S.Ct. 2163, 33 L.Ed.2d 83, 94, quoted by the majority, Supra. '(W)hen the opportunity of any large and identifiable segment of the community to be prospective trial jurors in criminal cases is drastically reduced), the effect is to remove from the jury room qualities of human nature and varieties of human experience, the range of which is unknown and perhaps unknowable. It is not necessary to assume that the excluded group will consistently vote as a class in order to conclude, as we do, that their exclusion deprives the jury of a perspective on human events that may have unsuspected importance in any case that may be presented.'