They don’t control research publications in other countries. 🤷

Also there is a ton of research on this topic from the last 50 years. So.

The opening paragraph for easy viewing:

Militant, nationalistic, white supremacist violent extremism has increased in the United States. In fact, the number of far-right attacks continues to outpace all other types of terrorism and domestic violent extremism. Since 1990, far-right extremists have committed far more ideologically motivated homicides than far-left or radical Islamist extremists, including 227 events that took more than 520 lives.[1] In this same period, far-left extremists committed 42 ideologically motivated attacks that took 78 lives.[2] A recent threat assessment by the U.S. Department of Homeland Security concluded that domestic violent extremists are an acute threat and highlighted a probability that COVID-19 pandemic-related stressors, long-standing ideological grievances related to immigration, and narratives surrounding electoral fraud will continue to serve as a justification for violent actions.[3]

So also: the right wing extremism is motivated by immigration ideology grievances and electoral fraud claims. Probably unrelated that an administration built on lies about immigration and electoral fraud wants this removed.

Was it blocked by one of those “free speech absolutists” I keep hearing about?

Relevant, but not, I believe, from that report directly.

Ah yes. “Now is not the time for political finger-pointing.”

“Comrade Krasnov is not pleased with your article”