I looked over that site and apart from this obit it seemed fairly OK. Maybe I didn’t look all that deeply.
Incidentally, Eustace Mullins was not as often claimed “an historian”.
Even the John Birch Society correctly recognized that he was nothing more than an anti-semitic propagandist.
In February 1966, Donald Gray, (the Birch Society’s Wholesale Book Division Business Manager) sent a memo to all of the Society’s American Opinion Bookstores. The purpose of the memo was to identify the type of material that should NOT be sold in, or recommended by, JBS bookstores.
Gray described such verboten material as:
“...most of the books and pamphlets with an anti-Semitic flavor which we omit from our booklist (that) are not of sufficient value in substance or scholarship to rise above the level of anti-Semitic invective or propaganda. Frankly, in our opinion, this applies to most of the books or pamphlets by Marilyn Allen, Richard Cotten, Myron Fagan, Kenneth Goff, Wickliffe Vennard, Eustace Mullins, Gerald L.K. Smith, Robert H. Williams, and Benjamin Freedman.”