U.S. Postal Service v. Flamingo Industries (U.S.A.), Inc. On February 25, 2004, the U.S. Supreme Court held that the U.S. Postal Service is not a “person” under the antitrust laws, and thus may not be sued under the Sherman Act when it engages in anticompetitive conduct. The decision was a setback for WLF, which filed a brief urging that the Postal Service not be given a special exemption. WLF argued that now that the Postal Service has largely been privatized and has begun competing with firms outside its traditional mail-delivery niche, it should be required to abide by the same antitrust laws that restrain the conduct of other businesses.