As public interest in the assassination swelled after JFK's release, Congress passed a law designed to increase the public's access to government records related to the assassination.
The author says a friend on the board tipped him off to the documents.
Afraid of a congressional investigation, Lemnitzer had ordered all Joint Chiefs documents related to the Bay of Pigs destroyed, says Bamford. But somehow, these remained.
"The scary thing is none of this stuff comes out until 40 years after," says Bamford.