John M. Butler (Papa Mac)

John Marshall Butler (July 21, 1897 – May 2, 1972) was an American politician and lawyer who served as the 2nd and last Director of the Internal Investigative Services, the 35th President of the United States, the 37th Vice President of the United States, and a Senator from Maryland.

Butler ascended to the presidency by virtue of being MacArthur's vice president upon his death, and vacated the office two years later, upon the election of John Hoover. A high-ranking and influential party luminary during the period of rule by the Republican Party, Butler was given the post of Director of the Internal Investigative Services in return for stepping aside and ceding the presidency to Hoover. Butler served in this capacity for eleven years, overseeing the domestic secret police tactics throughout the increasingly turbulent 1960s. Butler was one of those killed on Black Tuesday, May 2, 1972.