21ST PRECINCT was one of the realistic police drama series of the early- to mid-1950's that were aired in the wake of DRAGNET. Hard-boiled private detective series that often portrayed police as inept or incompetent were losing favor. NBC's DRAGNET had proven that a realistic police show  could attract and hold an audience.

NOTE:  The official title of the series according to the series scripts and the CBS series promotional materials was 21ST PRECINCT and not Twenty First Precinct or Twenty First Precinct which appears in many Old-Time Radio books.