A bestselling book on Area 51 is so controversial that it has shocked even its sources with an outrageous claim that the infamous Roswell, N.M., UFO crash of 1947 was really caused by Soviet leader Joseph Stalin and one of the most notorious Nazi criminals.

A group of retired test pilots, engineers and military personnel from the fabled Nevada military installation, who played a crucial role in investigative journalist Annie Jacobsen's new book "Area 51: An Uncensored History of America's Top Secret Military Base" (Little, Brown and Co.), are reportedly unhappy about the writer's shocking conclusion.

"It caught us completely by surprise -- we were blindsided," said T.D. Barnes, a former electronics, radar and communications expert who first came to work at Area 51 in 1968.

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