Listing groups is a tricky thing. Fash groups frequently dissolve and reconfigure themselves. Sometimes this is due to internal power struggles. Sometimes this is an attempt to escape bad publicity or legal responsibility.
Crypto-fascist groups will insist all their criminal supporters are simply lone wolves who had nothing to do with the organization - even when the criminal is a major donor, was indoctrinated by the organization, or appeared on video as an official spokesperson.
At the same time, attention-hungry groups will claim credit for attacks they had no involvement in - and the sort of person who would ACTUALLY murder people to get viewers for their manifesto is also the sort of person who would naturally jump in front of the cameras even without authorization.
Groups listed include not only fascist groups, but fash-adjacent groups.