This weekend, three people were killed in violent incidents outside Kansas City. From the earliest reports, the killings bore all the hallmarks of a terrorist attack.

There is still no consensus over the definition, but terrorism usually denotes a nonstate actor attacking civilian targets to spread fear for some putative political goal. And here we had a 73-year-old lone wolf opening fire on a Jewish community center and retirement home on Passover eve yelling “Heil Hitler.”

With time, it’s become even clearer that the alleged perpetrator is a terrorist. As founder of the Carolina Knights of the Ku Klux Klan and the White Patriot Party, Frazier Glenn Miller has a long history of militant anti-Semitism. The Southern Poverty Law Center described him as a “raging anti-Semite” known for posting online rants, like “No Jews, Just Right.” The Institute for Research & Education on Human Rights has also noted, “His worship for Hitler and Hitlerism is real.” According to the Center for the Study of Hate and Extremism, Miller is “one of the pioneers in the modern hate world, he’s been entrenched in the hate movement his entire adult life.”