Johnson states that "many pressures produce such censorship", some deliberate and some by default, but that "all have come, not from government, but from private corporations with something to sell". He notes an exchange in the letters page of "The New York Times" between Charles Tower, chairman of the National Association of Broadcasters Television Board and a reader, with Tower saying "There is a world of difference between the deletion of program material by Government command and the deletion by a private party as a broad-caster [...] Deletion by Government command is censorship [...] Deletion of material by private parties [...] is not censorship." but his respondent rebutting this with "Mr. Tower's distinction [...] is spurious. The essence of censorship is the suppression of a particular point of view [...] over the channels of the mass media, and the question of who does the censoring is one of form only." Johnson concurs with the latter view, stating that the outcome is the same.