Revisionist history is often a bitter pill to swallow, especially when the consensus has permeated the very language of the debate. In the early 1950s, one crucial issue divided American public opinion, and continued to do so for decades. The question centred on the nature of Soviet communism, and the internal threat posed by American agents working for the KGB in the United States. Was the ‘Konspiratsia’ real, or were the accusers simply political fantasists seeking ‘Reds under the beds’? The answer lies within the pages of John Earl Haynes and Harvey Klehr’s remarkable book.