OCTOBER TERM, 1960. Opinion of the Court. 364 U. S. The respondents find another barrier to the trial of this case in Colegrove v. Green, 328 U. S. 549. In that case the Court passed on an Illinois law governing the arrangement of congressional districts within that State. The complaint rested upon the disparity of population between the different districts which rendered the effectiveness of each individual's vote in some districts far less than in others. This disparity came to pass solely through shifts in population between 1901, when Illinois organized its congressional districts, and 1946, when the complaint was lodged.. During this entire period elections were held under the districting scheme devised in 1901. The Court affirmed the dismissal of the complaint on the ground that it presented a subject not meet for adjudication.* The decisive facts in this case, which at this -stage must be taken as proved, are wholly different from the considera,tions found controlling in Colegrove. That case involved a complaint of discriminatory apportionment f congressional districts. The appellants in Colegrove complained only of a dilution of the strength of their votes as a result of legislative inaction over a course of many years. The petitioners here complain that affirmative legislative action deprives them of their votes and the consequent advantages that the ballot affords. When a legislature thus singles out a readily isolated segment of a racial minority for special discriminatory treatment, it violates the Fifteenth Amendment. In no. case involving unequal weight in voting distribution that has come before the Court did the decision sanction a differentiation on racial lines whereby approval was given to unequivocal withdrawa] of the vote solely from colored citizens. Apart from all else, these considerations lift this *Soon after the decision in the Colegrove case, Governor Dwight H. Green of Illinois in his 1947 biennial message to the legislature recommended a reapportionment. The legislature immediately responded, Ill. Sess. Laws 1947, p. 879, and in 1951 redistricted again. Ill. Sess. Laws 1951, p. 1924.

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