Sacco and Vanzetti was the justice system corrupt?

Whether Sacco and Vanzetti were guilty or innocent is a case that remains a mystery. Historians argue both sides, but neither side has any facts that prove anything. Just raise questions. However, the jury that convicted them guilty was pretty confident that they did the crime. This is because I believe they were under the influence of a corrupt justice system. The justice system did not function properly in this case study because of several reasons. For one, the jury was already against Sacco and Vanzetti before the trial even began. Second, the prosecutor lied about the revolver one of them had was stolen from one of the guards. Third, the police hid that the cartridges that they found were not the same as the ones they had. But that is only my opinion. What do you think? Do you think that the justice system was indeed corrupt and that they would've been innocent if it wasn't corrupt? Or do you think otherwise?