One way to lobby for a change in language is in letters to the editor. (Or to bring attention on any subject.)

Personally, I''ll be lobbying to change White Supremacists, White Extremists, White Power movement, Militias, etc. to "White Terrorists." As noted in other posts on the thread, I think this is more accurate and a simpler transition from current language. YMMV. There are other labels suggested on this thread, like Right-Wing Terrorists, you might prefer. I like including "White" because I think this ultimately boils down to racism -- not just "right-wing" beliefs.

In addition to writing to papers/news local to your state/city/region, below are some nationals and progressive-friendly magazines.

I've also included cable and network news contacts.

When you write, cite a recent article (articles) that have instances of the objectionable term. Make a short case for a new, more meaningful and accurate, label. Note the the problematic language is used everywhere.

Best to keep it under 200 words, whether or not the outlet provides this as a guideline.

National Newspapers

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WaPo
Write to letters@washpost.com or to: Letters to the Editor, The Washington Post, 1301 K Street NW, Washington DC 20071.

Guidelines: [F]ewer than 200 words and take as their starting point an article or other item appearing in The Post.

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NYTimes
letters@nytimes.com

Guidelines: Letters should be exclusive to The New York Times or The International New York Times. We do not publish open letters or third-party letters. -- That is, customize for NYTimes citing a few articles with the objectionable term and noting that the term is pervasive.

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USA Today
letters@usatoday.com -- also need to be under 200 words (fewer the better).

Progressive Magazines

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The Atlantic
letters@theatlantic.com

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Mother Jones
backtalk@motherjones.com
or send snail mail to Backtalk, Mother Jones, P.O. Box 584, San Francisco, CA 94104-0584.

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The American Prospect
David Dayen, Executive Editor, ddayen@prospect.org

The American Prospect
1225 I Street NW, Suite 600, Washington, D.C. 20005
(202) 776-0730
info@prospect.org

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Harper's
Harper’s Magazine
666 Broadway, 11th Floor
New York, NY 10012
212-420-5720

To email us about articles in the magazine:
letters@harpers.org

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The Nation
https://www.thenation.com/letters-editor-0/

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Washington Monthly
1200 18th Street NW
Suite 330
Washington, DC 20036
Tel: 202-955-9010, Fax: 202-955-9011

Cable News and other network news

CNN
https://www.cnn.com/feedback

MSNBC
30 Rockefeller Plaza
New York, N.Y. 10112

ABC News
https://abcnews.go.com/contact
List of contacts for specific shows
https://abcnews.go.com/contact

NBC News
Assistant Managing Editor for Politics
Gregg Birnbaum / Gregg.Birnbaum@nbcuni.com

Assistant Managing Editor for News
Tim Perone / Tim.Perone@nbcuni.com

CBS News
Different contacts for evening weekday and weekend news. See https://www.cbsnews.com/news/contact-information-01-08-1998/