I am going to go with a split vote, JFK and Eisenhower.
Both were the last to warn of the shadowy figures who control from the sidelines.
Eisenhower in his farewell speech warned against the Military/Industrial complex that had plans, through devious means... to rule the world.
JFK in his farewell speech (sort of) at a New York university 10 says before his death, JFK vowed that before the end of his Presidency, he would reveal to the American people the things the Shadow Government was keeping secret from them.