In Little Helpers, historian John Robert Greene encourages us to rethink the scandals of Harry Truman's presidency by providing the first political biography of the man who precipitated them--Gen. Harry H. Vaughan. As the former president's close friend and military aide, Vaughan brought a number of disreputable figures into the White House, in addition to committing plenty of misconduct on his own. Although aware of Vaughan's misdeeds, Truman...