Espionage; Uncle Sam (Symbolic character); War posters, American; World War, 1939-1945--Posters--United States;
Color poster by Dal (Delorma Bostwick) Holcomb (1901-1978) that shows the cartoon character of a derby-clad gentleman whose mouth is covered by Uncle Sam's hand, with the word "Quiet!" printed at the man's eye level and the words "Loose talk can...