Another very important line of questioning aside from these about leaders and locations is the question of "what have they actually DONE?". Then I would have run down a list of things that are known to have been done by right-wing/religious terrorists, in the US and elsewhere.
Starting with "have they ever killed thousands of people and caused billions in property damage, like the religious conservative terrorist outfit we know as Al-Queda did on 9/11?".
"Have Antifa ever committed a crime like bombing a Federal Building, like the right-wing terrorist Timothy McVeigh, killing 168 Americans, purely based on his animosity towards the US Government?".
"Have they ever attacked law enforcement as a riotous mob, sending 100+ officers to the hospital, in a violent attempt to stop the peaceful transfer of power, as the Proud Boys and other right-wing extremist groups did on January 6, 2021?".
"Have they ever walked into a church and slaughtered many people in the congregation, like right-wing terrorist Dylan Roof?", etc, etc.
"No? Well, surely you can cite some kind of massive property damage and/or serious violence that put someone in the hospital at some point, committed by a known-member of Antifa, acting under the direction of "Antifa Leadership", right?
"Still no? Huh. So, it seems The FBI are persecuting "Antifa" for their political beliefs, i.e. that fascism, an ideology which we fought and defeated in WWII, is one that the USA should continue to oppose as we did in the last century, which is their 1st amendment right to do, wouldn't you say"?