Boston by Upton Sinclair is a novelized account of the Sacco and Vanzetti affair, a significant event in the 1920s involving two Italian immigrants, Nicola Sacco and Bartolomeo Vanzetti, who were accused of murder during a payroll robbery. The novel blends real events and characters with fictional elements. The narrative follows the trials of Sacco and Vanzetti, highlighting the biases and injustices of the legal system. The trials are depicted as a farce, with tainted evidence, dishonest witnesses, and a clear bias against the defendants due to their political beliefs and immigrant status. As the trials progress, the novel portrays the political and social tensions of the era, including the Red Scare, anti-immigrant sentiments, and the struggles of the labor movement.