The Heritage Foundation on Thursday alleged that it has been temporarily blocked from advertising and promoting on Amazon a new book about the Marxist ideological root of the Black Lives Matter (BLM) organization. In a news release, the Washington, D.C.-based think tank said it was informed by Amazon that its advertisement for the book “BLM: The Making of a New Marxist Revolution” failed to comply with the online retailer’s policy because it contained “content that is not allowed.” “Content that revolves around controversial or highly debated social topics is not permitted,” said Amazon in a message to Heritage. “Please remove this content from your ad.” Heritage said in an update that it has won the appeal of the decision, and was notified that it was the result of “human error.” “Whether this was the result of an algorithm or human action, the outcome is censorship,” Heritage concluded. The book, which …