Basically, the Nick Fuentes crowd, and to varying degrees, its neighbours like the Ye-Fuentes crew and the Vox Day crew. At one point, EMJ, Milo, and Rachel Fulton-Brown tried to stage an intervention for Owen Benjamin when he was on a Trinity-denying arc.
He and David Duke are two sides of the same coin. Duke believes that the root of the problem boils down to race (Jews), Jones believes that the root of the problem boils down to religion (Jews).
EMJ is one of the few people who advocates for the labor theory of economics established by the NSDAP. I'm not enough of an expert to lay out the similarities/differences, but this is part of his thought.