Seven Sweethearts (1942)
Seven Sweethearts is a 1942 musical film directed by Frank Borzage, starring Kathryn Grayson, Marsha Hunt and Van Heflin. Seven Sweethearts generated a bit of legal trouble seven years later. In 1949, Hungarian playwright Ferenc Herczeg sued MGM, Pasternak, and screenwriters Walter Reich and Leo Townsend for $200,000, claiming they had plagiarized his play Seven Sisters, which he had written in 1903 and which Paramount had adapted into The Seven Sisters a 1915 movie starring Madge Evans. Herczeg was imprisoned in a Nazi concentration camp in Hungary when Seven Sweethearts was produced and released, and consequently he didn't learn of the film's existence until 1948. The suit was settled out of court for a substantial amount.
More at Wikipedia.