[EricT.]

I don't understand whey Bundy didn't sue the BLM if they were failing to live up to BLM's responsibilities.

You cannot sue the Federal Government unless the Federal Government gives you permission to.

[DannyTN]

"You cannot sue the Federal Government unless the Federal Government gives you permission to."

If you google "Suits against BLM", it does not seem to be difficult to file suit against them.