NBC Radio. The photo was cropped by someone else initially, but "NBC" can be seen on the right side where the crop was made, along with "Earl", which would have been the first name of the NBC photographer.
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.