If these federales are not credentialed with uniforms, badges, name tags, etc. as some sort of duly authorized agents of the "law", then there can be no failure to obey such non-entities, IMO. There can be no recognition of what a lawful order is or is not, and therefore no failure, if they remain unidentified as lawful agents.
No more so than if Bubba from down the street kits himself up with camo, firearms, armor and a sticker that says Police and then insists that you obey his commands.
I'm guessing that most of these "police" are not far removed from "Bubba from down the street."