Not necessarily 'unjustly vilified', but most of Edgar Hoover's biography were done before the extend on soviet spying in the US was declassified. It talked about a very interesting podcast on a previous comment [1].
For example, Harry Truman, and his sacking of MacArthur. Now that there's been more info released regarding Army biowarfare programs in the late 40s/early 50s, recruitment of the Japanese specialists immediately after WW2, etc...