The real ‘Mank’ hated Hitler and helped refugees — he was also an isolationist
Holed up at a dusty ranch in Victorville, California, with a full-leg cast, screenwriter Herman J. Mankiewicz has been self-medicating as he works his way through a draft of “Citizen Kane.” When his secretary, Rita Alexander, learns he’s sneaked booze into the guest residence, she confronts his accomplice, a German nurse. “Frieda, you mustn’t let…