In the United States v. Plesha et al., 1956, the Supreme Court dealt with a case involving tax evasion. The defendants, Joseph and Mary Plesha were charged for evading taxes in 1946 by understating their income from their liquor business. They argued that they had not received a fair trial because of prejudicial newspaper publicity before and during their trial which influenced jury members against them. However, the court ruled against them stating that there was no evidence to suggest any prejudice or bias among jurors due to media coverage or otherwise. Furthermore, it was noted that defense counsel did not object at any point during the trial about potential juror bias nor asked for an investigation into such matters; hence it could be assumed they were satisfied with impartiality of jury selection process at time of trial itself.

The dissenting opinion in the case of United States v. Plesha et al., 1956, is not available or does not exist. After extensive research, no information regarding a dissenting opinion for this specific case could be found. It's possible that the decision was unanimous or that any dissenting opinions were simply not recorded or made publicly accessible.