I'm trying to find the title of a movie, maybe years 70's, about a "good guy" that is sent to a prison because the death of her young spouse, in a car accident that happened just after their wedding ceremony. He was driving the car and was considered DUI. He ended in a "model" prison where he discovered a plot of drugs selling. He found a way to denounce the plot to the prison's Director who was also involved in the crimes. I believe he ended killed after that