This book has grown out of the 16,000 pages of documents that the CIA released to me under the Freedom of Information Act. Without these documents, the best investigative reporting in the world could not have produced a book, and the secrets of CIA mind-control work would have remained buried forever, as the men who knew them had always intended. From the documentary base, I was able to expand my knowledge through interviews and readings in the behavioral sciences. Nevertheless, the final result is not the whole story of the CIA’s attack on the mind. Only a few insiders could have written that, and they choose to remain silent. I have done the best I can to make the book as accurate as possible, but I have been hampered by the refusal of most of the principal characters to be interviewed and by the CIA’s destruction in 1973 of many of the key documents.