Taxpayers have standing to sue to prevent the disbursement of federal funds in contravention of the specific constitutional prohibition against government support of religion. Decided June 10, 1968 (argued March 12, 1968). Opinion of the Court: Earl Warren → go there Dissenting: Harlan. Topic: Freedom of religion. Flast v. Cohen, 392 U.S. 83 (1968), was a United States Supreme Court case holding that federal taxpayers have standing to seek relief from the courts for claims that federal tax money is being used for unconstitutional purposes in violation of the Establishment Clause of the First Amendment. Wiki link