What does one refer to when discussing the 'tradition of the journalist-policiers' of the early 20th century ?

Answer 1

the begginning of the century saw a change in the press, and a strong investigative journalism movement started,,, muckraking is a word used to refer to the digging up of dirt on people and situations,,,,the emphasis was especially on corruption in big business,,,,, so in a way they policed America. most often they were published in the smaller, not main, newspapers, as the larger ones were becoming more geared to advertising,,,,,