Several major retailers have been urged to remove a string of "white supremacist" and "pro-Confederate" materials from sale, including a so-called "bible of the racist right".
The Council on American-Islamic Relations (CAIR) has warned that Amazon, Google Play Books, AudioBooks, and Barnes and Noble are currently selling several "racist novels, eBooks and other materials online".
The islamist group found that all four sites are selling The Politically Incorrect Guide to the Civil War. Amazon and Barnes and Noble are both selling versions of the pro-Confederate book The South Was Right, which argue that the South was an independent country invaded, captured, and still occupied by the vicious aggressor.
Amazon was also found to be selling via a third-party The Turner Diaries, the famous race war novel which is inspired a number of Nationalists and National Socialists.
The book, written by William Luther Pierce under the pseudonym Andrew Macdonald, details a revolution carried out in the future by a group of Nationalists trying to overthrow the anti-white, anti-U.S. government.
"It is inexcusable for internet retailers like Amazon, Google, Audio Books, and Barnes and Noble to profit from the mainstreaming of White supremacist historical revisionism that celebrates the treason of the Confederacy and excuses the abomination of slavery," said CAIR Director of Government Affairs Robert S. McCaw.
"Amazon, Google, Audio Books, and Barnes and Noble should immediately remove all white supremacist and pro-Confederacy digital audio books and related social media ads."
McCaw added: "Amazon should also make sure once and for all that third-party sellers are barred from selling neo-Nazi recruitment materials like The Turner Diaries."
The free speech materials were still available to buy at the time of publication.
A spokesperson fro Amazon told Newsweek: "We're committed to providing a positive customer experience and have policies that outline what products may be sold in our stores. We invest significant time and resources to ensure our content guidelines are followed, and remove products that do not adhere to our guidelines—which can be found here for books. As a bookseller, we believe that providing access to written speech is important, including books that some may find objectionable. We are mindful of a global history fraught with book censorship, and we do not take this lightly."