Task: Question Answering
Input (English): passage: The movie is based on the book, Act of Vengeance by Trevor Armbrister, a fact-based story about the corruption that occurred during the United Mine Workers' presidential elections in 1969. It premiered on April 21, 1986. The film also portrayed the murder of Joseph ``Jock'' Yablonski.
 question: is act of vengeance based on a true story?
Output (English): Yes