The Dragnet radio show is a police crime drama series surrounding Joe Friday and his few partners he has throughout the show. Dragnet ran from June 1949 – July 1957, and later became a tv show, also now in the public domain. Dragnet was thought up by Jack Webb, who also starred as Joe Friday. Jack Webb when developing Dragnet wanted to focus on reality, giving the police officers no bs underplayed personalities.
Check out the source for all these episodes here at… the source.