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Metro-Goldwyn-Mayer (MGM) was the primary film studio that Mary Astor was contracted to during the 1940s. Known for its iconic roaring lion logo, MGM was one of the prominent Hollywood studios during Hollywood's Golden Age. Astor's association with MGM solidified her status as a prominent actress, as she starred in notable films such as "The Maltese Falcon" and "Meet Me in St. Louis" while under their banner.