The L.A. chapter of the Guardian Angels is on “full alert” — and ready for action — after those evil people from that evil church in Kansas announced they would be protesting Liz Taylor‘s funeral … TMZ has learned.

Peter Steeves — a proud sporter of the red beret — tells us … “[Those evil people] have been arrested for doing this before, and if they get out of hand here in L.A., we’ll see to it that it happens again, and I’ll be signing their arrest documents.”

As TMZ first reported, the funeral is set to go down later today — we’re told the Angels are currently “getting ready.”

Stay tuned.