Free speech doesn't mean careless talk!, ca. 1942 - ca. 1943
Free speech doesn't mean careless talk! produced by Office for Emergency Management. War Production Board. (01/1942 - 11/03/1945)
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"National Archives of the United States - ARC Search Results: Details."
http://arcweb.archives.gov/arc/action/ExternalIdSearch?id=535383
National Archives
Public domain.