Michael Jackson's Doctor Arnie Klein WANTED -- Arrest Warrant Issued

Michael Jackson's doctor, Arnie Klein, is being hunted down by the U.S. Marshals ... and when he's found, he'll be arrested and dragged into court.

According to new documents ... obtained by TMZ ... Klein apparently failed to show up in court for his bankruptcy case, so the trustee could grill him about his assets that might be subject to seizure to satisfy his debts.

So today the bankruptcy judge directed the Marshals to arrest Arnie and haul his butt into court.

It's not the first time the judge issued a warrant. Back in February, after Klein refused to turn over his Ferrari and more than 100 pieces of wildly expensive pieces of art, the judge ordered the Marshals to arrest the doc and hold him until he turned over the goods. In that case Arnie folded like a cheap suit and told authorities where to find the cache.