The same powerful people that targeted socialists or civil rights leaders also influenced or even owned the media. It’s almost like the internet, at least early on, kind of broke that grip, and the rise of hard right media funded by billionaires with social media promotion weapons/bots/coordination is a response to that.
what makes you think that the content that appears on television is any sort of democratic free marketplace of ideas? why would that be the case, given its obviously corporate structure? like sure, you have "FOX News" presenting one Approved Viewpoint, and everyone else representing The Other Approved Viewpoint... but where are all the Unapproved Viewpoints on television? obviously, they're not there, for wholly obvious reasons.