Letter writers is a profession which involves that the person is commonly engaged in writing activities associated with the publishing of communications, official or unofficial announcements, job memos, scripts, among others.
Letter writers involved in the press industry could have a lot of reception as a product of the reader base of the publications they work for. Therefore, by berating a lawmaker for this person's decisions while doing his job, this could make the public have some misbeliefs or put certain labels to that lawmaker which are inappropriate. This could result in the lawmaker taking legal actions against the company the letter writer works for or the letter writer himself if he works as an independent professional.