The FBI is investigating death threats made in connection with Conrad Murray's release from jail ... and it appears they're being made by a group of Michael Jackson fanatics.
Law enforcement sources tell us ... the threats have been targeted at Murray's lawyer, Valerie Wass. Here are some of them:
-- "One blow to the head is all you need."
-- "If you think MJ fans are insignificant ... you are dead wrong, DEAD wrong"
-- "Better get that hair brushed and be ready because MJ fans will be everywhere setting yours and Murray's lies straight."
As for why the fans are targeting Wass, there are 2 reasons. First, because they don't know how to reach Murray. The second reason is based on video from the night of Murray's release, when Wass confronted a screaming Jackson fan who claimed Murray was a murderer. Wass fired back, "If you were not so ignorant, you would know he was not convicted of murder!" And she continued to rant.
Wass also said after Murray's release, "There's a small group of these Jackson fanatics. They're annoying, but insignificant."
We're told Wass called the FBI and was told they would investigate.
The FBI wouldn't confirm or deny threats were being investigated.