Most of the bigwigs left weeks ago, but today MGM began laying off 50 staffers, mostly from the post-production, marketing, and theatrical distribution departments. Once Spyglass Entertainment’s Gary Barber and Roger Birnbaum start running the studio when it emerges from its prepackaged bankruptcy and closes a $500M credit facility to make movies again, MGM said in court papers that its employee roster will number about 320 in 2011.

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