There’s a West Point study that had it’s link changed so that news articles referencing it got a 404 error. It still exists, but it has to be searched for directly to be found.

https://ctc.westpoint.edu/terrorist-groups/violent-far-right-terrorism/

If anyone wants to see it.

Edit: y’know what, here‘s more just in case anyone wants them before they disappear.

https://www.pbs.org/newshour/amp/show/u-s-sees-300-violent-attacks-inspired-far-right-every-year

https://pmc.ncbi.nlm.nih.gov/articles/PMC9335287/

https://pubmed.ncbi.nlm.nih.gov/35236192/

https://www.csis.org/analysis/escalating-terrorism-problem-united-states