I bet they didn't fuck it up. I bet the Dems just threw away the letter and destroyed evidence showing they received it, so they could call the technicality. Logical move when you're trying to find any way to stall through midterms.
Well then let's report it to the FBI… sauce?
Well now that I've looked into it it seems that they just aggregated publicly-available employment disclosures on LinkedIn. So Antifa actually hasn't broken any laws other than arguably inciting violence or domestic terrorism, which I would say is the case, but unfortunately it's unlikely we could get a case started at the FBI on that hunch. I'd imagine there isn't enough evidence at this point. So your original point stands, I guess, but not for the original reasons. :/