Joe Kennedy Sr., JFK's father and the patriarch of "America's Royal Family," left behind a complicated legacy, including anti-Semitism and Nazi sympathies. In 1928, Joe Kennedy Sr. sold two of his small film studios, creating RKO Pictures, best known for allowing 24-year-old wunderkind Orson Welles to make Citizen Kane, the revered film chronicling the rise and fall of Charles Foster Kane, an illustrious yet treacherous American magnate. But Joe Kennedy Sr.’s own rollercoaster of a biography trumps even the fictional Kane’s in every regard, from his hand-over-fist stock market days to his persona non grata period as a failed World...