Some work of photogs whose names were once well known decades ago. In this example, former newsreel photographers Marty Barnett and Charlie Mack appear in the credits.

In 1961, CBS aired a special report called Biography of a Bookie Joint.  The culmination of eight months of filming, it was the first investigative story to appear on network television news that used undercover cameras.

For some reason CBS has disabled embedding on this particular video, though it can be watched at this link on cbsnews.com.