Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
It appears to be the work of a federal official acting in his or her official capacity; it is referred to as the FBI poster, and is clearly a document intended for furthering a criminal investigation. Also, it is a published work dated in 1932, with no copyright notice. All of these factors indicate to me that this item is public domain.
{{msg:fairuse}} ( Unique historical images which we cannot reproduce by other means - 1932) from http://members.xoom.virgilio.it/all42day/history/h4mar/h4mar01.html (available elsewhere)
Captions
Lindbergh baby kidnapping poster, issued March 11, 1932