 After the Attack on Pearl Harbor on December 7 , 1941 , the Screen Writers Guild set up on December 8 , 1941 , the Hollywood Writers Mobilization , a body to organize writers for the war effort . Rossen served as the body 's chairman until 1944 and advocated the opening of a Second Front to support West European resistance again the Nazis . His earnings were much greater than in 1937 . However , his work for Hollywood Writers Mobilization and for the Communist Party forced him to abandon some partly developed film projects , including The Treasure of the Sierra Madre , which John Huston eventually directed in 1948 . 
