In the case of Bates v. United States in 1944, the Supreme Court ruled on whether or not a defendant could be convicted for refusing to answer questions before a grand jury about his political beliefs and affiliations. The defendant, Edward Joseph Bates, was summoned by a federal grand jury investigating possible violations of espionage laws during World War II. He refused to answer certain questions regarding his membership in the Communist Party and other related organizations citing that it would incriminate him under state law. The court held that Fifth Amendment protection against self-incrimination applies only when there is real danger of legal penalties being inflicted because of disclosures made under compulsion; hence it does not protect an individual from disclosing facts which might lead to social disgrace or loss of job but do not expose him/her to prosecution for violation of any statute. Therefore, since no evidence was presented showing that answering these questions would have exposed Bates to prosecution under any existing state law at the time he claimed privilege before the Grand Jury, his conviction for contempt was upheld.

In the dissenting opinion for Bates v. United States, Justice Frank Murphy argued that the majority's decision was a significant departure from traditional principles of criminal law and constitutional interpretation. He contended that it violated both due process rights and protections against self-incrimination by allowing prosecutors to use evidence obtained through compulsory registration under the Smith Act. According to him, this compelled individuals to provide information about their political beliefs and affiliations which could then be used against them in court. This, he believed, contradicted fundamental American values of freedom of thought and association as well as legal norms requiring voluntary confessions or admissions in criminal cases. Furthermore, he disagreed with the majority's view on "clear and present danger," arguing instead that mere membership or affiliation with an organization advocating overthrowing government did not necessarily mean imminent threat justifying such drastic measures.