The Warner brothers pooled their resources and moved into film production in 1910. Then, in 1912, they lent their support to filmmaker Carl Laemmle's Independent Motion Picture Company, which challenged the monopolistic control of the Edison Trust. That same year, Jack Warner acquired a job as a film splicer in New York, where he assisted brother Sam with the production of the film "Dante's Inferno". Despite the film's success at the box office, Harry Warner remained concerned about the economic threat presented by the Edison Trust. He subsequently broke with Laemmle and sent Jack to establish a film exchange in San Francisco, while Sam did the same in Los Angeles. The brothers were soon poised to exploit the expanding California movie market. In 1917, Jack was sent to Los Angeles to open another film exchange company. Their first opportunity to produce a major film came in 1918, when they purchased the film rights for "My Four Years in Germany", a bestselling novel that condemned German wartime atrocities. The film proved to be a commercial and critical success, and the four brothers were able to establish a studio in California. In the new studio, Jack became co-head of production along with his older brother, Sam. In this capacity, the two brothers secured new scripts and story lines, managed film production, and looked for ways to reduce production costs.