The year is 1923. The Ku Klux Klan is at the height of its power in the US as membership swells into the millions and they expand beyond their original southern borders. As they grow, so do their targets. As they continue their campaigns of terror against African Americans, their list now includes Catholics and Jews, southern and eastern Europeans, all in the name of "white supremacy." But they are no longer considered a terrorist organization. By adding the messages of moral decency, family values, and temperance, the Klan has slapped on a thin veneer of respectability and has become a "civic organization," attracting ordinary citizens, law enforcement, and politicians to their particular brand of white, Anglo-Saxon, and Protestant "Americanism."
Pennsylvania enthusiastically joined that wave. That was when the Grand Dragon of Pennsylvania decided to display the Klan's newfound power in a show of force. He chose a small town outside of Pittsburgh named after Andrew Carnegie; a small, unassuming borough full of "Catholics and Jews," the perfect place to teach these immigrants "a lesson." Some thirty thousand members of the Klan gathered from as far as Kentucky for "Karnegie Day." After initiating new members, they armed themselves with torches and guns to descend upon the town to show them exactly what Americanism was all about.
The Day the Klan Came to Town is a fictionalized retelling of the riot, focusing on a Sicilian immigrant, Primo Salerno. He is not a leader; he's a man with a troubled past. He was pulled from the sulfur mines of Sicily as a teen to fight in the First World War. Afterward, he became the focus of a local fascist and was forced to emigrate to the United States. He doesn't want to fight but feels that he may have no choice. The entire town needs him--and indeed everybody--to make a stand.