Cross collected 5,200 pints of blood plasma from studio employees and 763 of the studio's employees served in the armed forces, including Harry Warner's son-in-law Milton Sperling and Jack's son Jack Warner Jr. Following a dispute over ownership of Casablanca's Oscar for Best Picture, Wallis resigned. After Casablanca made Bogart a top star, Bogart's relationship with Jack deteriorated. In 1943, Olivia de Havilland (whom Warner frequently loaned to other studios) sued Warner for breach of contract. De Havilland had refused to portray famed abolitionist Elizabeth Blackwell in an upcoming film for Columbia Pictures. Warner responded by sending 150 telegrams to different film production companies, warning them not to hire her for any role. Afterwards, de Havilland discovered employment contracts in California could only last seven years; de Havilland had been under contract with the studio since 1935. The court ruled in de Havilland's favor and she left the studio in favor of RKO Radio Pictures, and, eventually, Paramount. Through de Havilland's victory, many of the studio's longtime actors were now freed from their contracts, and Harry decided to terminate the studio's suspension policy. The same year, Jack signed newly released MGM actress Joan Crawford, a former top star who found her career fading. Crawford's first role with the studio was 1944's Hollywood Canteen. Her first starring role at the studio, in the title role as Mildred Pierce (1945), revived her career and earned her an Oscar for Best Actress. After World War II: changing hands In the post-war years, Warner Bros. prospered greatly and continued to create new stars, including Lauren Bacall and Doris Day. By 1946, company payroll reached $600,000 a week and net profit topped $19.4 million. Jack Warner continued to refuse to meet Screen Actors Guild salary demands. In September 1946, employees engaged in a month-long strike. In retaliation, Warner—during his 1947 testimony before Congress about Mission to Moscow—accused multiple employees of ties to Communists. By the end of 1947, the studio reached a record net profit of $22 million. Warner acquired Pathé News from RKO in 1947. On January 5, 1948, Warner offered the first color newsreel, covering the Tournament of Roses Parade and the Rose Bowl Game. In 1948, Bette Davis, still their top actress and now hostile to Jack, was a big problem for Harry after she and others left the studio after completing the film Beyond the Forest. Warner was a party to