Who's Who in CIA: A biographical reference work on 3,000 officers of the civil and military branches of the secret services of the USA in 120 countries

from the foreword:
“The rulers of the USA are, of course, extremely interested in keeping the mantle of secrecy over their intelligence network. This mantle has been torn aside in not a few cases in recent months. The CIA answered by tightening up their secrecy directives and also by improving their cloak and dagger rules. The ‘invisible government’ shall have neither names nor faces.
For this reason the time appeared to have come to demask a first representative selection of leading officials and officers, collaborators and agents of the US intelligence services who are operating on five continents.”