Robert Milli

Rufus Sinclair was a cranky old millionaire with a terrible fear of being buried alive. After his apparent death, clauses in his will meant to prevent his being buried alive are violated by his uncaring family, and soon a masked figure begins prowling the family's Connecticut estate, slaughtering the family members one by one in a variety of separate, horrible ways. (imdb)

The protégé of a powerful congressman discovers his boss's corruption.