https://www.adl.org/resources/report/murder-and-extremism-united-states-2020
Just one, Left extremist, Uncle George.
I'm still looking around and finding the same.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.