The United States v. Rumely case in 1952 revolved around the question of whether Congress had exceeded its investigative powers by demanding that Edward A. Rumely disclose the names of those who purchased his books. The Select Committee on Lobbying Activities, established by the House of Representatives, was investigating lobbying efforts to influence legislation and requested a list of book purchasers from Rumely's organization, the Committee for Constitutional Government (CCG). When he refused to provide this information, he was charged with contempt of Congress. Rumely argued that this request violated his First Amendment rights as it would deter individuals from purchasing literature due to fear their political beliefs may be exposed. The Supreme Court ruled in favor of Rumely stating that while Congress has broad investigative powers necessary for effective law-making; these should not infringe upon an individual’s constitutional rights such as freedom speech or press unless absolutely essential for legislative purposes. This landmark decision underscored limitations on Congressional power and emphasized protection over individual liberties against potential governmental intrusion.

In the dissenting opinion for United States v. Rumely, Justice William O. Douglas argued that the Congressional committee had overstepped its bounds by demanding information about private citizens who purchased books from a publisher. He contended that this action violated First Amendment rights to freedom of speech and press, as well as Fourth Amendment protections against unreasonable searches and seizures. Douglas believed that such actions could lead to a chilling effect on free expression if individuals feared their reading habits would be scrutinized by government officials. Furthermore, he asserted that Congress did not have unlimited power to investigate private affairs without specific legislative purpose or necessity; it was not within their purview to act like a law enforcement or trial agency.