Are you 100% sure that sacco and vanzetti were guilty? why/why not

Yes, they were guilty

Explanation:

Sacco and Vanzetti were tried and found guilty in July 1921. During the six years before they were executed, their names became known throughout the world. Millions of people felt passionately that Sacco and Vanzetti were innocent, and millions more believed that they had not received a fair trial.