A screenwriter, novelist, labor leader, Hollywood insider, and feminist, Mary C. McCall Jr. was one of the film industry's most powerful figures in the 1940s and early 1950s. She was elected the first woman president of the Screen Writers Guild after leading the fight to unionize the industry's writers and secured the first contract guaranteeing a minimum wage, credit protection, and pay raises. Her advocacy was not welcomed by all: To screenwriters...