The U.S. Supreme Court case Irvin v. Dowd revolved around the issue of whether a defendant could receive a fair trial in an area where there was significant pretrial publicity that potentially influenced the jury's opinion. The petitioner, Leslie Irvin, was convicted for murder and sentenced to death by an Indiana state court. He appealed his conviction on grounds that he did not receive a fair trial due to extensive media coverage which created prejudice among potential jurors against him before the start of his trial. In 1958, the Supreme Court ruled in favor of Irvin stating that although it is not required for jurors to be totally ignorant about facts and issues involved in a case, they must have no fixed opinion about guilt or innocence at outset of trial. In this particular instance, eight out of twelve jurors admitted having formed opinions as to Irvin’s guilt prior to being selected for service; thus violating his right under Fourteenth Amendment's Due Process Clause ensuring impartiality within legal proceedings. This ruling set precedent emphasizing importance of unbiased juries and established guidelines regarding how courts should handle situations with substantial prejudicial pretrial publicity.

In the dissenting opinion for Irvin v. Dowd, Justice Clark argued that the majority's decision to grant a new trial was based on an incorrect interpretation of due process rights and jury impartiality. He contended that while it is crucial to ensure fair trials, this does not mean every juror must be completely ignorant of the facts of a case before trial begins - such a standard would be impossible in high-profile cases like this one. Instead, he suggested that jurors should only be disqualified if they have formed an opinion so strong it cannot be changed by evidence presented at trial. In his view, six out of twelve jurors having prior knowledge about the case did not necessarily indicate bias or partiality as long as they could still make decisions based solely on evidence presented during proceedings.