The Pentagon Papers:

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The Pentagon Papers were a top-secret study of US involvement in Vietnam commissioned by Secretary of Defense Robert McNamara in 1967. The study revealed that the Johnson administration had deceived the public and Congress about the extent of US involvement in the war, and that government officials had privately acknowledged that the war could not be won. The New York Times published excerpts from the papers in 1971, but the government successfully sued to block further publication. The case went to the Supreme Court, which ruled in favor of the Times, upholding the principle of freedom of the press. The publication of the papers contributed to widespread public disillusionment with the war and fueled political opposition to it.