Answer and Explanation:
The flaws in the trial of Nicola Sacco and Bartolol Vanzetti—who were both convicted of first degree murder and sentenced to death— were caused by the unfair rules that were used at the time: the trial judge was the only one who had the authority to decide the defendants’ (Sacco and Vanzetti) motions for a new trial. In fact, the trial judge denied all the defendants' motions for a new trial. Prior to this, the same trial judge allowed the prosecution to level charges against the defendants.
Also, the appellate rules that were in place at the time, did not authorize or permit the Supreme Court to review the evidence that prosecution leveled against the defendants at the trial.
