He also made a cult movie in the 60s called "Hey, Joe" (I think that is the name of it). It was nothing but a left wing propanda piece painting all conservatives as nuts, and left wingers as peace loving.
The title was just "JOE" and he played a Queens, NY type hardhat (an evil phrase to the left at that time) who's teenage daughter rebels and takes on a lifestyle that is so offensive to his small right-wing mind that he turns homicidal. It launched Boyle's career.