Aldrich Ames — American Criminal born on June 19, 1941,

Aldrich Hazen Ames is an American who was convicted of espionage against his country in 1994. He is serving a life sentence without the possibility of parole in the high-security Allenwood U.S. Penitentiary. Ames was formerly a 31-year Central Intelligence Agency counterintelligence officer and analyst who committed espionage against his country by spying for the Soviet Union and Russia. So far as it is known, Ames compromised the second-largest number of CIA agents—second only to those betrayed by Robert Hanssen... (wikipedia)

An espionage organization is a collector: it collects raw information. That gets processed by a machinery that is supposed to resolve its reliability, and to present a finished product.
By the late '70s I had come to question the point of a great deal of what we were doing, in terms of the CIA's overall charter.
Deciding whether to trust or credit a person is always an uncertain task.
I found that our Soviet espionage efforts had virtually never, or had very seldom, produced any worthwhile political or economic intelligence on the Soviet Union.
I said in court a long time ago that I didn't see that the Soviet Union was significantly helped by the information I gave them, nor that the United States was significantly harmed.