Who is really Killing GM...The Union? or GM?

From what I have been reading, but maybe I am reading it wrong but it seems the real culprit in GMs problems is the union. It seems like the union has
GM by the balls and is holding them hostage. How many jobs do you know where you get paid for not working when the assembly lines shut down for whatever reason and your medical care is paid for you 100%? Seems like union workers have it pretty good for turning some screws. Lets face it these union contracts are based on working conditions they faced in 1930 when things were bad for everybody during the depression. But this is the 21st century where the contracts are way outdated and uneeded. Thats why the Japanese have faired well in US factories with much less overhead do to NO Unions. So the question is...who is really doing the damage...GM...or the Unions?
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