Six corporations own 90% of news media companies in America. This claim is true. News Corp, Disney, Viacom, Time Warner, CBS and Comcast own 90% of the TV stations, radio stations, movies, magazines and newspapers that 277 million Americans rely on for news and entertainment.
https://www.truthorfiction.com/six-corporations-own-90-percent-of-news-media/
The governments of countries run by dictators and totalitarian regimes do exercise control over the media in their countries, suppressing any negative coverage of their leadership. North Korea, and China are examples of countries where state-run media is the norm.
https://www.sparknotes.com/us-government-and-politics/american-government/the-media/section3/
Donald Newhouse and his brother Samuel "Si" Newhouse inherited Advance Publications, a privately-held media company that controls a plethora of newspapers, magazine, cable TV and entertainment assets, from their father. Advance owns newspapers in 25 cities and towns across America and is the country's largest privately-held newspaper chain.
https://www.forbes.com/sites/katevinton/2016/06/01/these-15-billionaires-own-americas-news-media-companies/
media companies operate in the areas of broadcasting, news, print, e-learning, and motion pictures. In addition to Netflix, Disney, and Comcast, there are many other major media companies. What Is A Media Company Called?
https://www.nielsen.com/us/en/insights/resource/2022/winning-for-the-long-term-investing-in-diverse-owned-media/
pdf for "whoever controls the media".(Page 1 of about 17 results)