In the 1954 case of EMSPAK v. United States, the Supreme Court ruled on an issue involving labor union leaders who were convicted for not fully cooperating with a Congressional committee investigating alleged Communist infiltration in unions. The defendants, including Abraham Emspak, had refused to answer certain questions posed by the House Committee on Un-American Activities (HUAC), arguing that they were irrelevant and violated their First Amendment rights. They were subsequently charged and found guilty of contempt of Congress. The Supreme Court overturned these convictions in a split decision. The majority opinion held that while Congress has broad powers to investigate matters related to legislation, it does not have unlimited power to compel testimony from individuals without regard for their constitutional rights. It was determined that some questions asked by HUAC did indeed violate the defendants' First Amendment protections against self-incrimination and infringed upon their right to free speech and association. This ruling reaffirmed limits on Congressional investigative powers when they conflict with individual constitutional rights.

In the dissenting opinion for EMSPAK v. United States, Justice Minton argued that Emspak had willfully refused to answer questions posed by a Congressional committee and thus was in contempt of Congress. He believed that Emspak's refusal to answer on grounds of self-incrimination did not absolve him from his obligation as a citizen to provide information relevant to legislative inquiry. According to Justice Minton, the right against self-incrimination does not extend so far as allowing an individual to obstruct or impede legitimate legislative investigations into matters within its jurisdiction. The justice also disagreed with the majority's interpretation of "pertinency," arguing it should be determined by reference only to whether the question is related in any logical way with areas where Congress has power legislate rather than requiring direct connection between each specific question and some proposed legislation.