FBI? Secret Service? Homeland Security?
All of that an more.
National Guard.
Secret Service and DHS have no jurisdiction for this type of crime in DC. The DC Metropolitan PD does, but that’s not ensuring considering the poor leadership they have had re radicals and riots (due to poor planning and execution, the commies and anarchists have won millions in lawsuits over the past 50 years).
The mention of “mailbox bombs” could bring in DHS if they view this group as a national organization and threat (which they are). Hopefully the DC office of the FBI is still competent. I worked with them many years ago and they were real professionals. Hope leftist clowns like McCabe, Weissman, Strzok/Page and the Ohrs haven’t destroyed the field agents ability to do their job.