Supreme Court Justice
I am not sure if this is in the movie, but I think it is so interesting. Hoover hated Thomas Dewey, but he hated Harry Truman more. He made a deal with Dewey: Hoover would get Dewey elected (Hoover believed absolutely in his own power), and, in return, Dewey would nominate J. Edgar Hoover to the US Supreme Court, elevating him to the position of Chief Justice when the position became available. Can you imagine the impact that would have had on this country? It would have been a nightmare!
Source: biography of J. Edgar Hoover