There's a WHOLE RAFT of ways you can "impede" a "Federal official", and it doesn't have to be by force and violence.
And there's a WHOLE RAFT of "Federal officials", as you can see in my post #49.
You're aware that there's a lot of sections of U.S. Code 18?
The statute the people involved in the Oregon standoff are being charged under is this:
18 U.S. Code § 372 - Conspiracy to impede or injure officer: "If two or more persons in any State, Territory, Possession, or District conspire to prevent, by force, intimidation, or threat, any person from accepting or holding any office, trust, or place of confidence under the United States, or from discharging any duties thereof, or to induce by like means any officer of the United States to leave the place, where his duties as an officer are required to be performed, or to injure him in his person or property on account of his lawful discharge of the duties of his office, or while engaged in the lawful discharge thereof, or to injure his property so as to molest, interrupt, hinder, or impede him in the discharge of his official duties, each of such persons shall be fined under this title or imprisoned not more than six years, or both."
You're aware that there's a lot of sections of U.S. Code 18?
Yes there are, and the DOJ is now charging Cliven Bundy with a whole batch of them: Cliven Bundy Complaint.