Photo of Gen Hayden courtesy of the BBC
The papers, to be released next week, will detail assassination plots, domestic spying and wiretapping, kidnapping and human experiments.
Many of the incidents are already known, but the documents are expected to give more comprehensive accounts.
It is "unflattering" but part of agency history, CIA chief Michael Hayden said.
"This is about telling the American people what we have done in their name," Gen Hayden told a conference of foreign policy historians. CIA to reveal decades of misdeeds (more)
Mark Alexander