What factor was brought to light by the Sacco and Vanzetti case?

For plato users the answer is B. Many Americans were distrustful of foreigners

Sacco and Vanzetti were two Italian immigrants arrested and accussed of robbery and murder. Investigation brought to light that they were anarchists and radicals. As this happenned during the so called "red scare", some prejudice was also brought to light during the trial, which ended with the judgement of execution for both.