Final answer:
Nicola Sacco and Bartolomeo Vanzetti were killed due to their anarchist political affiliations and radical beliefs during a time of heightened fear and anxiety over communism in the United States.
Step-by-step explanation:
Nicola Sacco and Bartolomeo Vanzetti were killed due to their anarchist political affiliations and radical beliefs during a time of heightened fear and anxiety over communism in the United States. Although they were accused of armed robbery and murder, there was little direct evidence connecting them to the crime.
Their trial focused more on their political beliefs rather than their guilt or innocence. Despite subsequent appeals and motions for mistrial, Sacco and Vanzetti were executed in 1927.