sentences:  This abrupt reversal was not cost-free to the organization, however, as series of prominent members of the League of American Writers left the group's ranks.Those exiting during this "Yanks Are Not Coming" period included Archibald MacLeish, Malcolm Cowley, Van Wyck Brooks, Thomas Mann, and Granville Hicks, among others.In January 1940, the League formed a "Keep America Out of War Committee."