Mason is an advisor to Atomwaffen Division, a paramilitary neo-Nazi terrorist organization, which has been identified as part of the alt-right. Atomwaffen was responsible for 8 homicides in 2017–2019.[4][2][5][6][7][8] During a court case related to Atomwaffen, the prosecutor stated that Mason "may well represent the most violent, revolutionary and potentially terroristic expression of right-wing extremism current today."[9] He lives in a swastika-bedecked U.S. Government-funded apartment in Denver.[10]