Margaret Booth evolved from a negative cutter for D. W. Griffith into Irving Thalberg's preferred 'film editor' and, after Thalberg's death, Louis B. Mayer's supervising film editor — effectively the studio's final authority on cutting for nearly three decades. Appointed supervising editor in 1939, Booth didn't merely splice film; she reviewed dailies, hired editorial staff, and signed off on sound-and-picture edits for MGM classics ranging from The Wizard of Oz (1939) to Ben‑Hur (1959). Her influence was institutional: colleagues described her as 'tough' and fast, an embodiment of the studio system's concentration of power behind the scenes. By 1968, however, the old MGM guard was being swept aside. Booth later said she was fired by then-president James Aubrey — a moment that symbolized corporate upheaval and the erosion of the old studio hierarchies. In a telling Hollywood counterpoint, Ray Stark hired her the same night she left MGM, bringing her to Rastar as supervising editor; she went on to shepherd home-front hits such as The Owl and the Pussycat (1970), The Way We Were (1973) and Annie (1982). The arc — from the iron grip of studio authority to being dismissed in an Aubrey purge, then immediately reclaimed by a powerful independent producer — crystallizes the brutal power plays of the mid-century studio system and the shifting fortunes of even its most entrenched gatekeepers. Anecdotes such as Sidney Lumet's account of Booth arriving on location in 1965 demanding cuts to The Hill underscore both her exacting taste and the mounting friction between old-line studio overseers and a changing industry.
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