With the royalties from her anthology "Sisterhood Is Powerful", Morgan founded the first feminist grant-giving foundation in the US: "The Sisterhood Is Powerful Fund", which provided seed money to many early women's groups throughout the 1970s and 1980s. She made a decisive break from what she described as the "male Left" when she led the women's takeover of the underground newspaper "Rat" in 1970, and listed the reasons for her break in the first women's issue of the paper, in her essay titled "Goodbye to All That." The essay gained notoriety in the press for naming specific sexist men and institutions in the Left. Decades later, during the Democratic primaries for the 2008 presidential race, Morgan wrote a fiery sequel to her original essay, titled "Goodbye To All That #2", in defense of Hillary Clinton. The article quickly went viral on the internet for lambasting sexist rhetoric directed towards Clinton by the media.