The answer is in YOUR OWN FUCKING CITATION, idiot.
READ IT.
Okay, I take it you agree with their conclusions. On the other hand...
You ignored these findings by them:
Antifa is a contraction of the phrase “anti-fascist” and refers to a decentralized network of individuals...
Most Antifa supporters operate in secrecy to protect themselves from law enforcement agencies and right-wing extremists, and Antifa cells exist across North America, Australia, Europe—including the United Kingdom, Italy, and Germany—and other areas of the globe.
That is CISI admits Antifa is an organization as I stated and you deny. It is international in scope and does commit terrorist acts, if not in the US then abroad.
They sometimes organize in black blocs—ad hoc gatherings of individuals who wear black clothing, ski masks, scarves, sunglasses, and other material to conceal their faces—use improvised explosives and other homemade weapons, and resort to vandalism. In addition, Antifa members organize their activities through social media, encrypted peer-to-peer networks, and encrypted messaging services such as Signal. Antifa has also adopted anti-fascist symbols on their clothing, flags, and other paraphernalia, such as the two flags of the Antifaschistische Aktion and the three arrows of the Iron Front.
CISI says the same thing about how they use uniforms, symbols, flags, training, and other consistent operational methods as an organization.
Some members of Congress, such as Senators Bill Cassidy (R-LA) and Ted Cruz (R-TX), had already introduced a resolution in 2019 calling for Antifa to be designated a domestic terrorist organization.
When Antifa adherents clash with far-right demonstrators, violence occasionally breaks out, often involving fistfights, knives, fireworks, Molotov cocktails, and other improvised weapons. In June 2016, for example, Antifa and other protesters confronted a neo-Nazi rally in Sacramento, California, resulting in a chaotic brawl in which at least eight people were injured—including five who were stabbed, among them Antifa activists. Similarly, in February, March, and April 2017, Antifa members fought alt-right demonstrators at the University of California, Berkeley, using bricks, pipes, hammers, and homemade incendiary devices. At the “Unite the Right” rally in Charlottesville, Virginia, in August 2017, Antifa activists confronted alt-right demonstrators with clubs, shields, fists, chemical irritants, and balloons filled with paint and ink.
CISI admits and says they are violent and commit acts of terrorism in their actions.
You then accept CISI's conclusions without critical examination. When that is done (critically examined) CISI's conclusions are based on circular reasoning (eg, they cite their own studies) and claims with no supporting evidence. That is, their claims are their opinion and little more.
All that aside, you also focus solely on my use of CISI while ignoring everything else I and others have posted about Antifa because the overall picture presented is:
The are domestic terrorists
They pose a violent threat to the US and Americans
Their relative danger compared to other potential and real terrorist threats is IRRELEVANT! They are domestic terrorists.