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Photograph Title: Stop when you see this sign. This is the new insignia plate the Bureau of Prohibition has adopted for use by prohibition agents in stopping suspected automobiles.
In the photograph, from left to right, are; Prohibition Administrator Ames Woodcock, H.M. Lucious, secretary of the Automobile Club of Maryland, and Ernest M.Smith, vice-president of the A.A.A.
Harris & Ewing, photographer, August 25, 1930.
Library of Congress image.