In 1947, however, Warner served as a "friendly witness" for the House Un-American Activities Committee (HUAC), thereby lending support to allegations of a "Red" infiltration of Hollywood.
I 1947 optrådte Warner imidlertid som "venligt vidne" overfor House Un-American Activities Committee (HUAC), og støttede derigennem påstande om en "rød" infiltration af Hollywood.