GOMILLION v. LIGHTFOOT.
339
Opinion of the Court.
controversy out of the so-called "political" arena and into
the conventional sphere of constitutional litigation.
In sum, as Mr. Justice Holmes remarked, when dealing
with a related situation, in Nixon v. Herndon, 273 U. S.
536, 540, "Of course the petition concerns political action,"
but "The objection that the subject matter of the suit
is political is little more than a play upon words." A
statute which is alleged to have worked unconstitutional
deprivations of petitioners' rights is not immune to attack
simply because the mechanism employed by the legislature is a redefinition of municipal boundaries. According
to the allegations here made, the Alabama Legislature has
not merely redrawn the Tuskegee city limits with incidental inconvenience to the petitioners; it is more accurate
to say that it has deprived the petitioners of the municipal
franchise and consequent rights and to that end it has
incidentally changed-the city's boundaries. While in form
this is merely an act redefining metes and bounds, if tlhe
allegations ate established, the inescapable human effect
of this essay in geometry and geography is to despoil
colored citizens, and only colored citizens, of their theretofore enjoyed voting rights. That was not Colegrove v.
Green.
When a State'exercises power wholly within the domain
of state interest, it is insulated, from federal judicial
review. But such insulation is not carried over when
state power is used as an instrument for circumventing
a federally protected right. This principle has had many
applications. It has long been recognized in cases which
have prohibited a State from exploiting a power acknowledged to be absolute in an isolated context to justify the
imposition of an "unconstitutional condition." What the
Court has said in those cases is equally applicable here,
viz., that "Acts generally lawful may become unlawful
when done to accomplish an unlawful end, United States
v. Reading Co., 226 U. S.324, 357, and a constitutional
power cannot be used by way of condition to attain an