Final answer:
Bartolomeo Vanzetti believed he was found guilty due to being an immigrant with radical views during a period of strong nativist sentiment, rather than concrete evidence of his crimes.
Step-by-step explanation:
According to Bartolomeo Vanzetti, he was found guilty at his trial because he was an immigrant with radical views, and not because of evidence linking him to the crime. Vanzetti, along with Nicola Sacco, faced strong nativist sentiment during a time of heightened fear and anxiety over immigration and radicalism in America. Their trial became a symbol of the Red Scare that swept through America in the 1920s, focusing more on their political beliefs and ethnic background rather than the actual evidence against them. The men were associated with anarchist views, and this influenced their unfair trial and eventual execution, despite worldwide protests and serious doubts cast upon their guilt.