Ulrike Heider accused Konkin of endorsing historical negationism in his dealing with the Institute for Historical Review,  ,where he served on the Board of Directors, which included allotting advertisement space to the IHR in New Libertarian,  and writing a positive review of James J. Martin's book on Raphael Lemkin, which was published by the IHR https://en.wikipedia.org/wiki/Samuel_Edward_Konkin_III