JUSTICE SCALIA delivered the opinion of the Court.
This case requires us to clarify the application of the Sherman Act to municipal governments and to the citizens who seek action from them.
I
Petitioner Columbia Outdoor Advertising, Inc. (COA), a South Carolina corporation, entered the billboard business in the city of Columbia, South Carolina (also a petitioner here), in the 1940's. By 1981 it controlled more than 95% of what has been conceded...
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