Dave Bradley has been posting about the Lewis Powell Memo since at least 2010. More recently, it has been getting increasing exposure and mentions on social media, a good thing. Sheldon Whitehouse covered it in Speech 1 of his series The Scheme: The Powell Report. Jen Senko gave it substantial time in her award winning documentary, The Brainwashing of My Dad about the purposeful rise of right wing media in the U.S. Bill Moyers was all over it in 2012. It was a turning point for democracy.
If you don’t know what the Powell Memo is, Robert Reich provides a decent explanation. But you still should read the actual memo linked here.