In the 1943 case of Roberts v. United States, the Supreme Court upheld a decision by lower courts to deny citizenship to an immigrant based on his refusal to bear arms for the country due to religious beliefs. The petitioner, Jacob Roberts, was a British subject who had lived in America since childhood and sought naturalization as a U.S. citizen. However, he refused on religious grounds (as a Jehovah's Witness) to take an oath promising that he would bear arms in defense of the nation if required by law - one of several oaths required for naturalization at that time. The court ruled against him with Justice Felix Frankfurter writing for majority opinion stating: "Conscientious scruple against war is one thing; rejection even under pain of death or imprisonment forever...of all forms and degrees of loyalty short of actual military service is another." This ruling emphasized that while freedom from compulsory military service may be protected under certain circumstances such as conscientious objection status during wartime drafts, it does not extend protection when seeking privileges like citizenship which require affirmation towards national allegiance including potential armed defense.

In the dissenting opinion for Roberts v. United States, Justice Frank Murphy argued that the majority's decision to uphold a harsher sentence for a defendant who pleaded not guilty was fundamentally unfair and violated principles of justice. He contended that it is an individual's constitutional right to plead not guilty and demand a trial by jury, regardless of whether they are actually innocent or guilty. Therefore, he believed it was unjust to punish someone more severely simply because they exercised this right. Furthermore, he expressed concern about the potential chilling effect this could have on defendants' willingness to assert their rights in court out of fear of receiving harsher sentences if found guilty.