Based on the book My 30 Years in Hoover’s FBI by William G. Sullivan and William S. Brown, this made-for-cable biopic stars Treat Williams as the infamous Director of the Federal Bureau of Investigation., Treat Williams portrays the FBI director who served for 48 years under eight Administrations. Rip Torn, David Ogden Stiers, Andrew Duggan. Tolson: Robert Harper. John F. Kennedy: Art Hindle. Robert F. Kennedy: James F. Kelly. McCarthy: Charles Hallahan. Palmer: John McLiam. Truman: Walker Edmiston.