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I’m conflicted here. I’m familiar enough with online “leftist” (especially of the supposed anti-colonial stripe) spaces to know how many bad, often highly illegal things are coordinated there. But I’m familiar enough with the FBI to know that their actual activities often consist of terrorizing political dissidents for no other reason than to neutralize their opinions. Without more information, it’s sensible to to default to innocent until proven guilty and push the FBI to justify themselves.
More recently, focus narrowed from violent extremism to RMVE, racially-motivated violent extremism, focusing on white supremacist groups--the definition of "white supremacist" being interpreted so broadly as to include explicitly anti-racist libertarian groups.
Given that the FBI officially considers "violent extremism" something to be extirpated, and defines it so broadly that the majority of the activity falling under that umbrella is legal political activity, I don't really see how you can possibly make the case that the FBI isn't trying to quash dissent. FBI raids have a chilling effect on political activity, they know this, and they use it.