Question: When was Kathryn Grayson of the 1946 American musical comedy, Ziegfeld Follies, under contract to Metro-Goldwyn-Mayer?
Sentence (from "Kathryn Grayson"): She was under contract to Metro-Goldwyn-Mayer by the early 1940s, soon establishing a career principally through her work in musicals.
Relevant evidence: Yes