Title: Act of Vengeance
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
Answer: yes