 In August 1938, Marshall began his last trip to Alaska, which included further exploration of the Brooks Range.He became a subject of interest of the House Un-American Activities Committee, a House of Representatives committee investigating "un-American" activities.Known as the Dies Committee for its chairman, Martin Dies, the committee announced in "The New York Times" that eight federal officials (including Marshall) were contributing to communism because of their connections to such organizations as the Workers Alliance and the American League for Peace and Democracy.